LINUX admin

www.ph.ed.ac.uk......Page 0
Linux Network Administrators Guide......Page 1
Preface......Page 14
Sources of Information......Page 16
File System Standards......Page 23
Standard Linux Base......Page 24
About This Book......Page 25
The Official Printed Version......Page 27
Overview......Page 29
Conventions Used in This Book......Page 31
Submitting Changes......Page 32
Acknowledgments......Page 33
Introduction to Networking......Page 35
TCP/IP Networks......Page 37
UUCP Networks......Page 46
Linux Networking......Page 47
Maintaining Your System......Page 49
IPX and the NCP Filesystem......Page 52
TCP/IP Firewall......Page 54
IP Accounting......Page 57
IP Masquerade and Network Address Translation......Page 59
The NetworkFile System......Page 62
Using NIS with Shadow Support......Page 65
Using the passwd and group Maps......Page 66
NIS Server Security......Page 69
The Network Information System......Page 71
Mounting an NFS Volume......Page 76
The NFS Daemons......Page 79
The exports File......Page 80
Kernel-Based NFSv2 Server Support......Page 83
Kernel-Based NFSv3 Server Support......Page 84
Configuringthe NetworkingHardware......Page 85
Name Service and Resolver Configuration......Page 94
Resolving Host Names......Page 102
A Tour of Linux Network Devices......Page 104
Ethernet Installation......Page 106
The PLIP Driver......Page 109
The PPP and SLIP Drivers......Page 112
Other Network Types......Page 113
Issues of TCP/IP Networking......Page 114
Interface Configuration for IP......Page 116
Configuring TCP/IP Networking......Page 124
Getting EximUp and Running......Page 126
Sendmail......Page 129
ImportantNetwork Features......Page 131
IP Addresses......Page 134
Address Resolution......Page 137
IP Routing......Page 139
The Internet Control Message Protocol......Page 145
The Point-to-Point Protocol......Page 146
Running in Server Mode......Page 149
Running pppd......Page 154
Using Options Files......Page 156
Using chat to Automate Dialing......Page 157
IP Configuration Options......Page 160
Link Control Options......Page 164
General Security Considerations......Page 166
Authentication with PPP......Page 167
Debugging Your PPP Setup......Page 171
More Advanced PPP Configurations......Page 172
IPX and Linux......Page 178
Configuring the Kernel for IPXand NCPFS......Page 180
Configuring IPX Interfaces......Page 181
Configuring an IPX Router......Page 184
Mounting a Remote NetWare Volume......Page 188
Exploring Some of the Other IPX Tools......Page 196
Printing to a NetWare Print Queue......Page 199
NetWare Server Emulation......Page 203
What Is a Firewall?......Page 204
What Is IP Filtering?......Page 206
Setting Up Linux for Firewalling......Page 208
Three Ways We Can Do Filtering......Page 211
Original IP Firewall (2.0 Kernels)......Page 213
IP Firewall Chains (2.2 Kernels)......Page 220
Netfilter and IP Tables (2.4 Kernels)......Page 230
TOS Bit Manipulation......Page 238
Testing a Firewall Configuration......Page 241
A Sample Firewall Configuration......Page 243
Configuring IP Accounting......Page 251
Using IP Accounting Results......Page 257
Resetting the Counters......Page 259
Flushing the Ruleset......Page 260
Passive Collection of Accounting Data......Page 261
Configuring the Kernel for IP Masquerade......Page 262
Configuring IP Masquerade......Page 264
Handling Name Server Lookups......Page 267
More About Network Address Translation......Page 268
Tips and Tricks......Page 269
If Your Mail Doesn't Get Through......Page 272
Compiling Exim......Page 274
Mail Delivery Modes......Page 275
Miscellaneous config Options......Page 277
Message Routing and Delivery......Page 278
Protecting Against Mail Spam......Page 283
UUCP Setup......Page 284
Configuring elm......Page 286
Installing sendmail......Page 289
Overview of Configuration Files......Page 290
The sendmail.cf and sendmail.mc Files......Page 291
Generating the sendmail.cf File......Page 297
Interpreting and Writing Rewrite Rules......Page 298
Configuring sendmail Options......Page 304
Some Useful sendmail Configurations......Page 306
Testing Your Configuration......Page 313
Running sendmail......Page 318
The tcpd Access Control Facility......Page 319
The Services and Protocols Files......Page 322
Remote Procedure Call......Page 324
Configuring Remote Loginand Execution......Page 326
ManagingTaylor UUCP......Page 333
Serial Devices and the login: Prompt......Page 338
Running named......Page 341
Netnews......Page 354
How Does Mail Routing Work?......Page 356
Electronic Mail......Page 361
Installing the Binaries......Page 365
Setting the Hostname......Page 366
Assigning IP Addresses......Page 367
Creating Subnets......Page 369
Writing hosts and networks Files......Page 370
All About ifconfig......Page 372
The netstat Command......Page 375
Checking the ARP Tables......Page 379
Using the Configuration Utilities......Page 381
Serial Line IP......Page 388
Configuring the Serial Hardware......Page 390
Example Network:The Virtual Brewery......Page 392
How DNS Works......Page 394
NIS Versus NIS+......Page 402
The Client Side of NIS......Page 403
Running an NIS Server......Page 404
Setting Up an NIS Client with GNU libc......Page 406
Choosing the Right Maps......Page 408
Useful Cable Configurations......Page 411
Using dip......Page 412
Dealing with Private IP Networks......Page 418
SLIP Operation......Page 419
nn Configuration......Page 423
A Serial NULL Modem Cable......Page 425
Introduction to Serial Devices......Page 427
Accessing Serial Devices......Page 428
Serial Hardware......Page 431
Linux Network Administrator's Guide, Second Edition Copyright Information......Page 433
UUCP Configuration Files......Page 435
Controlling Access to UUCP Features......Page 449
Setting Up Your System for Dialing In......Page 452
UUCP Low-Level Protocols......Page 456
Troubleshooting......Page 459
Log Files and Debugging......Page 462
How Is Mail Delivered?......Page 464
Email Addresses......Page 466
trn Configuration......Page 468
Newsreader Configuration......Page 470
What Is Usenet, Anyway?......Page 472
How Does Usenet Handle News?......Page 474
C News......Page 476
NNTP and thenntpd Daemon......Page 479
Internet News......Page 489
Installation......Page 492
The sys File......Page 495
The active File......Page 499
Article Batching......Page 501
Expiring News......Page 504
Miscellaneous Files......Page 507
Control Messages......Page 509
C News in an NFS Environment......Page 512
Maintenance Tools and Tasks......Page 513
Installing the NNTP Server......Page 515
Restricting NNTP Access......Page 516
NNTP Authorization......Page 518
nntpd Interaction with C News......Page 519
Newsreaders and INN......Page 520
Installing INN......Page 521
Configuring INN: the Basic Setup......Page 522
INN Configuration Files......Page 523
Running INN......Page 536
Managing INN: The ctlinnd Command......Page 537
1. Applicability and Definitions......Page 542
2. Verbatim Copying......Page 544
3. Copying in Quantity......Page 545
4. Modifications......Page 546
5. Combining Documents......Page 548
6. Collections of Documents......Page 549
7. Aggregation with Independent Works......Page 550
8. Translation......Page 551
9. Termination......Page 552
10. Future Revisions of this License......Page 553
SAGE: The SystemAdministrators Guild......Page 554