By Olaf Kirch
O'Reilly used to be first, yet there are publishers now beating them at their video game. "Linux community Administrator's advisor" is an okay publication. It took the time to introduce me to TCP/IP routing and gateways, yet it really is a type of books it's essential begin numerous instances to get it.
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Extra resources for Linux Network Administrator's Guide
Conventions Used in This Book All examples presented in this book assume you are using a sh compatible shell. The bash shell is sh compatible and is the standard shell of all Linux distributions. If you happen to be a csh user, you will have to make appropriate adjustments. The following is a list of the typographical conventions used in this book: Italic Used for file and directory names, program and command names, command−line options, email addresses and pathnames, URLs, and for emphasizing new terms.
5. IP Over Serial Lines On serial lines, a de facto standard exists known as SLIP, or Serial Line IP. A modification of SLIP known as CSLIP, or Compressed SLIP, performs compression of IP headers to make better use of the relatively low bandwidth provided by most serial links. Another serial protocol is PPP, or the Point−to−Point Protocol. PPP is more modern than SLIP and includes a number of features that make it more attractive. Its main advantage over SLIP is that it isn't limited to transporting IP datagrams, but is designed to allow just about any protocol to be carried across it.
Of course, any software you use can be dangerous because software may have bugs that clever people might exploit to gain access to your system. Things like this happen, and there's no complete protection against it.  If you install a setuid program for network purposes, be doubly careful to check the documentation so that you don't create a security breach by accident. Another source of concern should be programs that enable login or command execution with limited authentication. The rlogin, rsh, and rexec commands are all very useful, but offer very limited authentication of the calling party.
Linux Network Administrator's Guide by Olaf Kirch