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LINUX Network Administrator Guide-Linux 网络管理员指导教程
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上传时间: 2011-02-22
详细说明： Available via WWW ............................................................................................................. 14 Documentation Available Commercially....................................................................................................... 14 Linux Journal and Linux Magazine............................................................................................................... 15 Linux Usenet Newsgroups ......................................................................................... .................................... 15 Linux Mailing Lists....................................................................................................................................... 15 Online Linux Support ................................................................................................................................... 16 Linux User Groups ....................................................................................................................................... 16 Obtaining Linux............................................................................................................................................ 16 FILE SYSTEM STANDARDS................................................................................................................................. 17 STANDARD LINUX BASE ................................................................................................................................... 17 ABOUT THIS BOOK............................................................................................................................................ 18 THE OFFICIAL PRINTED VERSION....................................................................................................................... 19 OVERVIEW ........................................................................................................................................................ 19 CONVENTIONS USED IN THIS BOOK ................................................................................................................... 20 SUBMITTING CHANGES ..................................................................................................................................... 21 ACKNOWLEDGMENTS........................................................................................................................................ 21 The Hall of Fame.......................................................................................................................................... 22 CHAPTER 1 - INTRODUCTION TO NETWORKING................................................................................. 23 HISTORY ........................................................................................................................................................... 23 TCP/IP NETWORKS........................................................................................................................................... 23 Introduction to TCP/IP Networks.................................................................................................................. 24 Ethernets....................................................................................................................................................... 25 Other Types of Hardware............................................................................................................................. 26 The Internet Protocol ................................................................................................................................... 27 IP Over Serial Lines ..................................................................................................................................... 28 The Transmission Control Protocol .............................................................................................................. 28 The User Datagram Protocol....................................................................................................................... 29 More on Ports............................................................................................................................................... 29 The Socket Library ....................................................................................................................................... 29 UUCP NETWORKS ............................................................................................................................................ 30 LINUX NETWORKING......................................................................................................................................... 30 Different Streaks of Development.................................................................................................................. 31 Where to Get the Code ................................................................................................................................. 31 MAINTAINING YOUR SYSTEM ............................................................................................................................ 32 System Security............................................................................................................................................. 32 CHAPTER 2 - ISSUES OF TCP/IP NETWORKING..................................................................................... 34 NETWORKING INTERFACES ............................................................................................................................... 34 IP ADDRESSES................................................................................................................................................... 34 ADDRESS RESOLUTION...................................................................................................................................... 36 IP ROUTING ...................................................................................................................................................... 36 IP Networks .................................................................................................................................................. 36 Subnetworks.................................................................................................................................................. 37 Gateways ...................................................................................................................................................... 37 The Routing Table ........................................................................................................................................ 39 Metric Values ............................................................................................................................................... 40 THE INTERNET CONTROL MESSAGE PROTOCOL................................................................................................. 40 RESOLVING HOST NAMES ................................................................................................................................. 41 CHAPTER 3 - CONFIGURING THE NETWORKING HARDWARE........................................................ 42 KERNEL CONFIGURATION ................................................................................................................................. 44 Kernel Options in Linux 2.0 and Higher ....................................................................................................... 44 Kernel Networking Options in Linux 2.0.0 and Higher................................................................................. 46 5 A TOUR OF LINUX NETWORK DEVICES.............................................................................................................. 48 ETHERNET INSTALLATION................................................................................................................................. 49 Ethernet Autoprobing ................................................................................................................................... 49 THE PLIP DRIVER............................................................................................................................................. 51 THE PPP AND SLIP DRIVERS............................................................................................................................ 52 OTHER NETWORK TYPES .................................................................................................................................. 52 CHAPTER 4 - CONFIGURING THE SERIAL HARDWARE...................................................................... 53 COMMUNICATIONS SOFTWARE FOR MODEM LINKS ........................................................................................... 53 INTRODUCTION TO SERIAL DEVICES .................................................................................................................. 53 ACCESSING SERIAL DEVICES ............................................................................................................................. 54 The Serial Device Special Files..................................................................................................................... 55 SERIAL HARDWARE........................................................................................................................................... 55 USING THE CONFIGURATION UTILITIES.............................................................................................................. 56 The setserial Command ................................................................................................................................ 56 The stty Command........................................................................................................................................ 58 SERIAL DEVICES AND THE LOGIN: PROMPT........................................................................................................ 60 Configuring the mgetty Daemon.................................................................................................................... 60 CHAPTER 5 - CONFIGURING TCP/IP NETWORKING ............................................................................ 63 MOUNTING THE /PROC FILESYSTEM................................................................................................................... 63 INSTALLING THE BINARIES................................................................................................................................ 63 SETTING THE HOSTNAME .................................................................................................................................. 64 ASSIGNING IP ADDRESSES ................................................................................................................................ 64 CREATING SUBNETS.......................................................................................................................................... 65 WRITING HOSTS AND NETWORKS FILES.............................................................................................................. 65 INTERFACE CONFIGURATION FOR IP .................................................................................................................. 66 The Loopback Interface................................................................................................................................ 67 Ethernet Interfaces ....................................................................................................................................... 68 Routing Through a Gateway......................................................................................................................... 69 Configuring a Gateway ................................................................................................................................ 70 The PLIP Interface ....................................................................................................................................... 70 The SLIP and PPP Interfaces....................................................................................................................... 71 The Dummy Interface ................................................................................................................................... 71 IP Alias......................................................................................................................................................... 71 ALL ABOUT IFCONFIG ....................................................................................................................................... 72 THE NETSTAT COMMAND.................................................................................................................................. 74 Displaying the Routing Table........................................................................................................................ 74 Displaying Interface Statistics...................................................................................................................... 75 Displaying Connections................................................................................................................................ 75 CHECKING THE ARP TABLES............................................................................................................................ 76 CHAPTER 6 - NAME SERVICE AND RESOLVER CONFIGURATION .................................................. 78 THE RESOLVER LIBRARY .................................................................................................................................. 78 The host.conf File ......................................................................................................................................... 78 The nsswitch.conf File .................................................................................................................................. 80 Configuring Name Server Lookups Using resolv.conf .................................................................................. 81 Resolver Robustness ..................................................................................................................................... 82 HOW DNS WORKS............................................................................................................................................ 83 Name Lookups with DNS.............................................................................................................................. 84 Types of Name Servers ................................................................................................................................. 85 The DNS Database ....................................................................................................................................... 85 Reverse Lookups........................................................................................................................................... 87 RUNNING NAMED .............................................................................................................................................. 88 The named.boot File..................................................................................................................................... 88 The BIND 8 host.conf File............................................................................................................................ 90 The DNS Database Files ............................................................................................................................... 91 Caching-only named Configuration .............................................................................................................. 93 Writing the Master Files............................................................................................................................... 94 Verifying the Name Server Setup................................................................................................................... 96 Other Useful Tools ....................................................................................................................................... 98 6 CHAPTER 7 - SERIAL LINE IP....................................................................................................................... 99 GENERAL REQUIREMENTS................................................................................................................................. 99 SLIP OPERATION .............................................................................................................................................. 99 DEALING WITH PRIVATE IP NETWORKS........................................................................................................... 101 USING DIP........................................................................................................................................................ 101 A Sample Script .......................................................................................................................................... 102 A dip Reference .......................................................................................................................................... 103 RUNNING IN SERVER MODE ............................................................................................................................. 105 CHAPTER 8 - THE POINT-TO-POINT PROTOCOL ................................................................................ 108 PPP ON LINUX ................................................................................................................................................ 108 RUNNING PPPD ................................................................................................................................................ 109 USING OPTIONS FILES ..................................................................................................................................... 110 USING CHAT TO AUTOMATE DIALING .............................................................................................................. 110 IP CONFIGURATION OPTIONS.......................................................................................................................... 112 Choosing IP Addresses............................................................................................................................... 112 Routing Through a PPP Link ...................................................................................................................... 113 LINK CONTROL OPTIONS................................................................................................................................. 114 GENERAL SECURITY CONSIDERATIONS............................................................................................................ 115 AUTHENTICATION WITH PPP............................................................................................................................ 116 PAP Versus CHAP ..................................................................................................................................... 116 The CHAP Secrets File............................................................................................................................... 117 The PAP Secrets File.................................................................................................................................. 117 DEBUGGING YOUR PPP SETUP ........................................................................................................................ 118 MORE ADVANCED PPP CONFIGURATIONS....................................................................................................... 118 PPP Server ................................................................................................................................................. 118 Demand Dialing ......................................................................................................................................... 120 Persistent Dialing....................................................................................................................................... 120 CHAPTER 9 - TCP/IP FIREWALL ............................................................................................................... 122 METHODS OF ATTACK..................................................................................................................................... 122 WHAT IS A FIREWALL?.................................................................................................................................... 123 WHAT IS IP FILTERING?.................................................................................................................................. 124 SETTING UP LINUX FOR FIREWALLING............................................................................................................. 125 Kernel Configured with IP Firewall............................................................................................................ 125 The ipfwadm Utility .................................................................................................................................... 126 The ipchains Utility .................................................................................................................................... 126 The iptables Utility ..................................................................................................................................... 126 THREE WAYS WE CAN DO FILTERING ............................................................................................................. 126 ORIGINAL IP FIREWALL (2.0 KERNELS)........................................................................................................... 127 Using ipfwadm............................................................................................................................................ 128 A More Complex Example.......................................................................................................................... 130 Summary of ipfwadm Arguments................................................................................................................. 131 IP FIREWALL CHAINS (2.2 KERNELS) .............................................................................................................. 133 Using ipchains............................................................................................................................................ 134 ipchains Command Syntax .......................................................................................................................... 134 Our Naïve Example Revisited...................................................................................................................... 137 Listing Our Rules with ipchains .................................................................................................................. 137 Making Good Use of Chains ....................................................................................................................... 138 NETFILTER AND IP TABLES (2.4 KERNELS)...................................................................................................... 141 Backward Compatability with ipfwadm and ipchains ................................................................................. 143 Using iptables............................................................................................................................................. 143 Our Naïve Example Revisited, Yet Again .................................................................................................... 147 TOS BIT MANIPULATION................................................................................................................................ 147 Setting the TOS Bits Using ipfwadm or ipchains......................................................................................... 148 Setting the TOS Bits Using iptables............................................................................................................. 148 TESTING A FIREWALL CONFIGURATION ........................................................................................................... 149 A SAMPLE FIREWALL CONFIGURATION ........................................................................................................... 150 CHAPTER 10 - IP ACCOUNTING................................................................................................................. 157 CONFIGURING THE KERNEL FOR IP ACCOUNTING............................................................................................ 157 7 CONFIGURING IP ACCOUNTING....................................................................................................................... 157 Accounting by Address ............................................................................................................................... 158 Accounting by Service Port ......................................................................................................................... 159 Accounting of ICMP Datagrams ................................................................................................................. 161 Accounting by Protocol ............................................................................................................................... 161 USING IP ACCOUNTING RESULTS..................................................................................................................... 162 Listing Accounting Data with ipfwadm ....................................................................................................... 162 Listing Accounting Data with ipchains........................................................................................................ 162 Listing Accounting Data with iptables ........................................................................................................ 162 RESETTING THE COUNTERS............................................................................................................................. 163 FLUSHING THE RULESET ................................................................................................................................. 163 PASSIVE COLLECTION OF ACCOUNTING DATA................................................................................................. 163 CHAPTER 11 - MASQUERADE AND NETWORK ADDRESS TRANSLATION.................................. 165 SIDE EFFECTS AND FRINGE BENEFITS .............................................................................................................. 166 CONFIGURING THE KERNEL FOR IP MASQUERADE........................................................................................... 166 CONFIGURING IP MASQUERADE ...................................................................................................................... 167 Setting Timing Parameters for IP Masquerade........................................................................................... 169 HANDLING NAME SERVER LOOKUPS ............................................................................................................... 169 MORE ABOUT NETWORK ADDRESS TRANSLATION.......................................................................................... 169 CHAPTER 12 - IMPORTANT NETWORK FEATURES............................................................................ 171 THE INETD SUPER SERVER ............................................................................................................................... 171 THE TCPD ACCESS CONTROL FACILITY............................................................................................................ 173 THE SERVICES AND PROTOCOLS FILES............................................................................................................. 174 REMOTE PROCEDURE CALL............................................................................................................................. 175 CONFIGURING REMOTE LOGIN AND EXECUTION.............................................................................................. 176 Disabling the r; Commands........................................................................................................................ 176 Installing and Configuring ssh .................................................................................................................... 177 CHAPTER 13 - THE NETWORK INFORMATION SYSTEM................................................................... 182 GETTING ACQUAINTED WITH NIS.................................................................................................................... 182 NIS VERSUS NIS+ .......................................................................................................................................... 184 THE CLIENT SIDE OF NIS ................................................................................................................................ 184 RUNNING AN NIS SERVER ............................................................................................................................... 185 NIS SERVER SECURITY................................................................................................................................... 186 SETTING UP AN NIS CLIENT WITH GNU LIBC.................................................................................................. 186 CHOOSING THE RIGHT MAPS........................................................................................................................... 188 USING THE PASSWD AND GROUP MAPS............................................................................................................. 189 USING NIS WITH SHADOW SUPPORT................................................................................................................ 190 CHAPTER 14 - THE NETWORK FILE SYSTEM....................................................................................... 192 PREPARING NFS.............................................................................................................................................. 193 MOUNTING AN NFS VOLUME .......................................................................................................................... 193 THE NFS DAEMONS........................................................................................................................................ 194 THE EXPORTS FILE .......................................................................................................................................... 195 KERNEL-BASED NFSV2 SERVER SUPPORT ...................................................................................................... 196 KERNEL-BASED NFSV3 SERVER SUPPORT ...................................................................................................... 197 CHAPTER 15 - IPX AND THE NCP FILESYSTEM.................................................................................... 198 XEROX, NOVELL, AND HISTORY...................................................................................................................... 198 IPX AND LINUX .............................................................................................................................................. 199 Caldera Support ......................................................................................................................................... 199 More on NDS Support ................................................................................................................................ 199 CONFIGURING THE KERNEL FOR IPX AND NCPFS........................................................................................... 199 CONFIGURING IPX INTERFACES...................................................................................................................... 200 Network Devices Supporting IPX................................................................................................................ 200 IPX Interface Configuration Tools .............................................................................................................. 200 The ipx_configure Command....................................................................................................................... 200 The ipx_interface Command........................................................................................................................ 201 CONFIGURING AN IPX ROUTER........................................................................................................................ 202 8 Static IPX Routing Using the ipx_route Command ..................................................................................... 202 Internal IPX Networks and Routing ............................................................................................................ 203 MOUNTING A REMOTE NETWARE VOLUME..................................................................................................... 205 A Simple ncpmount Example ....................................................................................................................... 205 The ncpmount Command in Detail.............................................................................................................. 205 Hiding Your NetWare Login Password ....................................................................................................... 207 A More Complex ncpmount Example .......................................................................................................... 207 EXPLORING SOME OF THE OTHER IPX TOOLS.................................................................................................. 207 Server List................................................................................................................................................... 207 Send Messages to NetWare Users ............................................................................................................... 208 Browsing and Manipulating Bindery Data.................................................................................................. 208 PRINTING TO A NETWARE PRINT QUEUE ......................................................................................................... 209 Using nprint with the Line Printer Daemon................................................................................................ 210 Managing Print Queues .............................................................................................................................. 211 NETWARE SERVER EMULATION ...................................................................................................................... 211 CHAPTER 16 - MANAGING TAYLOR UUCP ............................................................................................ 212 UUCP TRANSFERS AND REMOTE EXECUTION ................................................................................................. 213 The Inner Workings of uucico ..................................................................................................................... 213 uucico Command-line Options .................................................................................................................... 214 UUCP CONFIGURATION FILES......................................................................................................................... 215 A Gentle Introduction to Taylor UUCP....................................................................................................... 215 What UUCP Needs to Know........................................................................................................................ 217 Site Naming ................................................................................................................................................ 217 Taylor Configuration Files.......................................................................................................................... 218 General Configuration Options Using the config File ................................................................................ 218 How to Tell UUCP About Other Systems Using the sys File ...................................................................... 218 Identifying Available Devices Through the port File .................................................................................. 222 How to Dial a Number Using the dial File.................................................................................................. 223 UUCP Over TCP........................................................................................................................................ 223 Using a Direct Connection......................................................................................................................... 224 CONTROLLING ACCESS TO UUCP FEATURES .................................................................................................. 224 Command Execution................................................................................................................................... 224 File Transfers ............................................................................................................................................. 225 Forwarding................................................................................................................................................. 225 SETTING UP YOUR SYSTEM FOR DIALING IN.................................................................................................... 226 Providing UUCP Accounts......................................................................................................................... 226 Protecting Yourself Against Swindlers ........................................................................................................ 227 Be Paranoid: Call Sequence Checks ........................................................................................................... 227 Anonymous UUCP ..................................................................................................................................... 228 UUCP LOW-LEVEL PROTOCOLS...................................................................................................................... 228 Protocol Overview...................................................................................................................................... 228 Tuning the Transmission Protocol .............................................................................................................. 229 Selecting Specific Protocols ........................................................................................................................ 229 TROUBLESHOOTING ........................................................................................................................................ 230 uucico Keeps Saying "Wrong Time to Call"................................................................................................ 230 uucico Complains That the Site Is Already Locked ..................................................................................... 230 You Can Connect to the Remote Site, but the Chat Script Fails.................................................................. 230 Your Modem Does Not Dial ........................................................................................................................ 231 Your Modem Tries to Dial but Doesn't Get Out .......................................................................................... 231 Login Succeeds, but the Handshake Fails ................................................................................................... 231 LOG FILES AND DEBUGGING ............................................................................................................................ 231 CHAPTER 17 - ELECTRONIC MAIL........................................................................................................... 233 WHAT IS A MAIL MESSAGE?........................................................................................................................... 233 HOW IS MAIL DELIVERED? .............................................................................................................................. 235 EMAIL ADDRESSES.......................................................................................................................................... 236 RFC-822 ..................................................................................................................................................... 236 Obsolete Mail Formats............................................................................................................................... 236 Mixing Different Mail Formats ................................................................................................................... 237 HOW DOES MAIL ROUTING WORK?................................................................................................................. 237 Mail Routing on the Internet ....................................................................................................................... 237 9 Mail Routing in the UUCP World ............................................................................................................... 238 Mixing UUCP and RFC-822 ....................................................................................................................... 239 CONFIGURING ELM.......................................................................................................................................... 241 Global elm Options..................................................................................................................................... 241 National Character Sets .............................................................................................................................. 241 CHAPTER 18 - SENDMAIL........................................................................................................................... 243 INTRODUCTION TO SENDMAIL .......................................................................................................................... 243 INSTALLING SENDMAIL ................................................................................................................................... 243 OVERVIEW OF CONFIGURATION FILES ............................................................................................................. 244 THE SENDMAIL.CF AND SENDMAIL.MC FILES.................................................................................................... 244 Two Example sendmail.mc Files ................................................................................................................. 244 Typically Used sendmail.mc Parameters .................................................................................................... 245 GENERATING THE SENDMAIL.CF FILE............................................................................................................... 248 INTERPRETING AND WRITING REWRITE RULES ................................................................................................ 248 sendmail.cf R and S Commands .................................................................................................................. 248 Some Useful Macro Definitions................................................................................................................... 248 The Lefthand Side....................................................................................................................................... 249 The Righthand Side..................................................................................................................................... 249 A Simple Rule Pattern Example................................................................................................................... 250 Ruleset Semantics ....................................................................................................................................... 250 CONFIGURING SENDMAIL OPTIONS .................................................................................................................. 252 SOME USEFUL SENDMAIL CONFIGURATIONS.................................................................................................... 253 Trusting Users to Set the From: Field......................................................................................................... 253 Managing Mail Aliases............................................................................................................................... 253 Using a Smart Host .................................................................................................................................... 254 Managing Unwanted or Unsolicited Mail (Spam) ...................................................................................... 255 Configuring Virtual Email Hosting ............................................................................................................. 257 TESTING YOUR CONFIGURATION ..................................................................................................................... 258 RUNNING SENDMAIL ....................................................................................................................................... 261 TIPS AND TRICKS............................................................................................................................................. 261 Managing the Mail Spool ............................................................................................................................ 262 Forcing a Remote Host to Process its Mail Queue ..................................................................................... 262 Analyzing Mail Statistics ............................................................................................................................. 262 CHAPTER 19 - GETTING EXIM UP AND RUNNING.............................................................................. 265 RUNNING EXIM ............................................................................................................................................... 265 IF YOUR MAIL DOESN'T GET THROUGH........................................................................................................... 266 COMPILING EXIM ............................................................................................................................................ 267 MAIL DELIVERY MODES ................................................................................................................................. 267 MISCELLANEOUS CONFIG OPTIONS .................................................................................................................. 268 MESSAGE ROUTING AND DELIVERY................................................................................................................. 269 Routing Messages....................................................................................................................................... 269 Delivering Messages to Local Addresses .................................................................................................... 269 Alias Files................................................................................................................................................... 270 Mailing Lists............................................................................................................................................... 271 PROTECTING AGAINST MAIL SPAM.................................................................................................................. 272 UUCP SETUP .................................................................................................................................................. 272 CHAPTER 20 - NETNEWS ............................................................................................................................. 274 USENET HISTORY............................................................................................................................................ 274 WHAT IS USENET, ANYWAY? .......................................................................................................................... 274 HOW DOES USENET HANDLE NEWS?............................................................................................................... 275 CHAPTER 21 - C NEWS................................................................................................................................. 278 DELIVERING NEWS.......................................................................................................................................... 278 INSTALLATION ................................................................................................................................................ 279 THE SYS FILE................................................................................................................................................... 280 THE ACTIVE FILE............................................................................................................................................. 283 ARTICLE BATCHING........................................................................................................................................ 283 EXPIRING NEWS .............................................................................................................................................. 285 10 MISCELLANEOUS FILES ................................................................................................................................... 287 CONTROL MESSAGES ...................................................................................................................................... 288 The cancel Message.................................................................................................................................... 288 newgroup and rmgroup ............................................................................................................................... 288 The checkgroups Message.......................................................................................................................... 288 sendsys, version, and senduuname .............................................................................................................. 289 C NEWS IN AN NFS ENVIRONMENT ................................................................................................................. 290 MAINTENANCE TOOLS AND TASKS .................................................................................................................. 290 CHAPTER 22 - NNTP AND THE NNTPD DAEMON.................................................................................. 292 THE NNTP PROTOCOL.................................................................................................................................... 293 Connecting to the News Server.................................................................................................................... 293 Pushing a News Article onto a Server ......................................................................................................... 293 Changing to NNRP Reader Mode ............................................................................................................... 294 Listing Available Groups............................................................................................................................ 295 Listing Active Groups................................................................................................................................. 295 Posting an Article....................................................................................................................................... 295 Listing New Articles ................................................................................................................................... 296 Selecting a Group on Which to Operate...................................................................................................... 296 Listing Articles in a Group .......................................................................................................................... 296 Retrieving an Article Header Only.............................................................................................................. 296 Retrieving an Article Body Only.................................................................................................................. 297 Reading an Article from a Group................................................................................................................ 297 INSTALLING THE NNTP SERVER...................................................................................................................... 298 RESTRICTING NNTP ACCESS.......................................................................................................................... 298 NNTP AUTHORIZATION.................................................................................................................................. 299 NNTPD INTERACTION WITH C NEWS................................................................................................................. 299 CHAPTER 23 - INTERNET NEWS................................................................................................................ 301 SOME INN INTERNALS.................................................................................................................................... 301 NEWSREADERS AND INN ................................................................................................................................ 303 INSTALLING INN............................................................................................................................................. 303 CONFIGURING INN: THE BASIC SETUP............................................................................................................. 303 INN CONFIGURATION FILES ............................................................................................................................ 304 Global Parameters ..................................................................................................................................... 304 Configuring Newsgroups............................................................................................................................ 305 Configuring Newsfeeds............................................................................................................................... 306 Controlling Newsreader Access .................................................................................................................. 309 Expiring News Articles ............................................................................................................................... 311 Handling Control Messages ........................................................................................................................ 312 RUNNING INN................................................................................................................................................. 314 MANAGING INN: THE CTLINND COMMAND..................................................................................................... 315 Add a New Group ....................................................................................................................................... 315 Change a Group ......................................................................................................................................... 315 Remove a Group......................................................................................................................................... 316 Renumber a Group ..................................................................................................................................... 316 Allow/Disallow Newsreaders ...................................................................................................................... 316 Reject Newsfeed Connections..................................................................................................................... 316 Allow Newsfeed Connections...................................................................................................................... 317 Disable News Server................................................................................................................................... 317 Restart News Server ................................................................................................................................... 317 Display Status of a Newsfeed....................................................................................................................... 317 Drop a Newsfeed ........................................................................................................................................ 317 Begin a Newsfeed ....................................................................................................................................... 318 Cancel an Article........................................................................................................................................ 318 CHAPTER 24 - NEWSREADER CONFIGURATION................................................................................. 319 TIN CONFIGURATION ....................................................................................................................................... 319 TRN CONFIGURATION...................................................................................................................................... 320 NN CONFIGURATION........................................................................................................................................ 320 APPENDIX A ................................................................................................................................................... 322 11 EXAMPLE NETWORK: THE VIRTUAL BREWERY ............................................................................................... 322 CONNECTING THE VIRTUAL SUBSIDIARY NETWORK........................................................................................ 322 APPENDIX B - USEFUL CABLE CONFIGURATIONS ............................................................................. 323 A PLIP PARALLEL CABLE ............................................................................................................................... 323 A SERIAL NULL MODEM CABLE .................................................................................................................... 323 APPENDIX C - COPYRIGHT INFORMATION.......................................................................................... 325 PREAMBLE ...................................................................................................................................................... 325 APPLICABILITY AND DEFINITIONS.................................................................................................................... 325 VERBATIM COPYING ....................................................................................................................................... 326 COPYING IN QUANTITY ................................................................................................................................... 326 MODIFICATIONS .............................................................................................................................................. 327 COMBINING DOCUMENTS................................................................................................................................ 328 COLLECTIONS OF DOCUMENTS........................................................................................................................ 328 AGGREGATION WITH INDEPENDENT WORKS .................................................................................................... 328 TRANSLATION ................................................................................................................................................. 329 TERMINATION ................................................................................................................................................. 329 FUTURE REVISIONS OF THIS LICENSE ............................................................................................................... 329 APPENDIX D ................................................................................................................................................... 330 ...展开收缩
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