III. Network Services Reference .................................................................................................... 159
13. Network Scripts .............................................................................................................. 161
13.1. Interface Configuration Files ........................................................................... 161
13.2. Interface Control Scripts .................................................................................. 164
13.3. Network Functions........................................................................................... 165
14. Firewalling with iptables ............................................................................................ 167
14.1. Packet Filtering ................................................................................................ 167
14.2. Differences between iptables and ipchains ............................................. 168
14.3. Options Used in iptables Commands.......................................................... 168
14.4. Storing iptables Information ....................................................................... 175
14.5. Additional Resources ....................................................................................... 175
15. Apache ............................................................................................................................ 177
15.1. Default Modules............................................................................................... 177
15.2. Starting and Stopping httpd........................................................................... 178
15.3. Configuration Directives in httpd.conf ....................................................... 179
15.4. Adding Modules to Your Server ...................................................................... 196
15.5. Using Virtual Hosts.......................................................................................... 198
15.6. Additional Resources ....................................................................................... 200
16. Email............................................................................................................................... 201
16.1. Protocols .......................................................................................................... 201
16.2. Email Program Classifications......................................................................... 203
16.3. Sendmail .......................................................................................................... 204
16.4. Fetchmail.......................................................................................................... 208
16.5. Procmail ........................................................................................................... 212
16.6. Security ............................................................................................................ 218
16.7. Additional Resources ....................................................................................... 219
17. Berkeley Internet Name Domain (BIND) ....................................................................... 221
17.1. Introduction to DNS and BIND ....................................................................... 221
17.2. BIND Configuration Files................................................................................ 222
17.3. Using rndc ...................................................................................................... 233
17.4. BIND Advanced Features ................................................................................ 235
17.5. Common Mistakes to Avoid ............................................................................ 237
17.6. Additional Resources ....................................................................................... 237
18. Network File System (NFS)............................................................................................ 239
18.1. Methodology.................................................................................................... 239
18.2. NFS Server Configuration Files....................................................................... 241
18.3. NFS Client Configuration Files ....................................................................... 243
18.4. Securing NFS................................................................................................... 245
18.5. Additional Resources ....................................................................................... 246
19. Lightweight Directory Access Protocol (LDAP)............................................................ 249
19.1. What is LDAP? ................................................................................................ 249
19.2. Pros and Cons of LDAP................................................................................... 249
19.3. Uses for LDAP................................................................................................. 249
19.4. LDAP Terminology.......................................................................................... 250
19.5. OpenLDAP 2.0 Enhancements ........................................................................ 251
19.6. OpenLDAP Files.............................................................................................. 251
19.7. OpenLDAP Daemons and Utilities.................................................................. 253
19.8. Modules for Adding Extra Functionality to LDAP ......................................... 254
19.9. OpenLDAP Setup Overview............................................................................ 254
19.10. Configuring Your System to Authenticate Using OpenLDAP....................... 255
19.11. Additional Resources ..................................................................................... 256
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