Table of Contents

Preface. Chapter 1. Introduction to Networking History TCP/IP Networks UUCP Networks Linux Networking Maintaining Your System. Chapter 2. Issues of TCP/IP Networking Networking Interfaces IP Addresses Address Resolution IP Routing The Internet Control Message Protocol Resolving Host Names. Chapter 3. Configuring the Networking Hardware Kernel Configuration A Tour of Linux Network Devices Ethernet Installation The PLIP Driver The PPP and SLIP Drivers Other Network Types. Chapter 4. Configuring the Serial Hardware Communications Software for Modem Links Introduction to Serial Devices Accessing Serial Devices Serial Hardware Using the Configuration Utilities Serial Devices and the login: Prompt. Chapter 5. Configuring TCP/IP Networking Mounting the /proc Filesystem Installing the Binaries Setting the Hostname Assigning IP Addresses Creating Subnets Writing hosts and networks Files Interface Configuration for IP All About ifconfig The netstat Command Checking the ARP Tables. Chapter 6. Name Service and Resolver Configuration The Resolver Library How DNS Works Running named. Chapter 7. Serial Line IP General Requirements SLIP Operation Dealing with Private IP Networks Using dip Running in Server Mode. Chapter 8. The Point-to-Point Protocol PPP on Linux Running pppd Using Options Files Using chat to Automate Dialing IP Configuration Options Link Control Options General Security Considerations Authentication with PPP Debugging Your PPP Setup More Advanced PPP Configurations. Chapter 9. TCP/IP Firewall Methods of Attack What Is a Firewall? What Is IP Filtering? Setting Up Linux for Firewalling Three Ways We Can Do Filtering Original IP Firewall (2.0 Kernels) IP Firewall Chains (2.2 Kernels) Netfilter and IP Tables (2.4 Kernels) TOS Bit Manipulation Testing a Firewall Configuration A Sample Firewall Configuration Chapter 10. IP Accounting Configuring the Kernel for IP Accounting Configuring IP Accounting Using IP Accounting Results Resetting the Counters Flushing the Ruleset Passive Collection of Accounting Data. Chapter 11. IP Masquerade and Network Address Translation Side Effects and Fringe Benefits Configuring the Kernel for IP Masquerade Configuring IP Masquerade Handling Name Server Lookups More About Network Address Translation. Chapter 12. Important Network Features The inetd Super Server The tcpd Access Control Facility The Services and Protocols Files Remote Procedure Call Configuring Remote Login and Execution. Chapter 13. The Network Information System Getting Acquainted with NIS NIS Versus NIS+ The Client Side of NIS Running an NIS Server NIS Server Security Setting Up an NIS Client with GNU libc Choosing the Right Maps Using the passwd and group Maps Using NIS with Shadow Support. Chapter 14. The Network File System Preparing NFS Mounting an NFS Volume The NFS Daemons The exports File Kernel-Based NFSv2 Server Support Kernel-Based NFSv3 Server Support. Chapter 15. IPX and the NCP Filesystem Xerox, Novell, and History IPX and Linux Configuring the Kernel for IPX and NCPFS Configuring IPX Interfaces Configuring an IPX Router Mounting a Remote NetWare Volume Exploring Some of the Other IPX Tools Printing to a NetWare Print Queue NetWare Server Emulation. Chapter 16. Managing Taylor UUCP UUCP Transfers and Remote Execution UUCP Configuration Files Controlling Access to UUCP Features Setting Up Your System for Dialing In UUCP Low-Level Protocols Troubleshooting Log Files and Debugging. Chapter 17. Electronic Mail What Is a Mail Message? How Is Mail Delivered? Email Addresses How Does Mail Routing Work? Configuring elm. Chapter 18. Sendmail Introduction to sendmail Installing sendmail Overview of Configuration Files The sendmail.cf and sendmail.mc Files Generating the sendmail.cf File Interpreting and Writing Rewrite Rules Configuring sendmail Options Some Useful sendmail Configurations Testing Your Configuration Running sendmail Tips and Tricks. Chapter 19. Getting Exim Up and Running Running Exim If Your Mail Doesn't Get Through Compiling Exim Mail Delivery Modes Miscellaneous config Options Message Routing and Delivery Protecting Against Mail Spam UUCP Setup. Chapter 20. Netnews Usenet History What Is Usenet, Anyway? How Does Usenet Handle News? Chapter 21. C News Delivering News Installation The sys File The active File Article Batching Expiring News Miscellaneous Files Control Messages C News in an NFS Environment Maintenance Tools and Tasks. Chapter 22. NNTP and the nntpd Daemon The NNTP Protocol Installing the NNTP Server Restricting NNTP Access NNTP Authorization nntpd Interaction with C News. Chapter 23. Internet News Some INN Internals Newsreaders and INN Installing INN Configuring INN: the Basic Setup INN Configuration Files Running INN Managing INN: The ctlinnd Command. Chapter 24. Newsreader Configuration tin Configuration trn Configuration nn Configuration Appendix A. Example Network: The Virtual Brewery. Appendix B. Useful Cable Configurations. Appendix D. SAGE: The System Administrators Guild Index

About the Author

Terry Dawson is an amateur radio operator and long time Linux enthusiast. He is the author of a number of network related HOWTO documents for the Linux Documentation Project and is an active participant in a number of other Linux projects. Terry has 15 years professional experience in telecommunications and is currently engaged in network management research in the Telstra Research Laboratories. Terry lives in Sydney with his wife Maggie, and son Jack. Olaf Kirch has a degree in Mathematics but turned his back on category theory and compact continuous lattices after booting his first Linux kernel some time in 92. He vividly recalls the joy of learning Unix by reading Linux kernel code. Since that time, he has participated in various Linux projects, including writing large parts of its NFS implementation, and running the first Linux security mailing list with Jeff Uphoff in 95. He currently works for Caldera Systems, where he is responsible for much of the network related stuff as well as security issues, and sometimes finds himself wondering whether he's dreaming or if all this is real. In his spare time, he enjoys being with Maren and their daughter Jule. And in case you actually read the bio in the first edition of the Network Administrator's Guide, Olaf does have a driving license now.