Security Reference - Red Hat ENTERPRISE LINUX 3 Reference Manual

III. Security Reference
Using secure protocols is a critical part of maintaining system integrity. This part describes critical
tools used for the purpose of user authentication, network access control, and secure network com-
munication. For more information about securing a Red Hat Enterprise Linux system, refer to the Red
Hat Enterprise Linux Security Guide.
Table of Contents
15. Pluggable Authentication Modules (PAM) ............................................................................. 229
16. TCP Wrappers and ..................................................................................................... 239
xinetd
17. ................................................................................................................................... 253
iptables
18. Kerberos..................................................................................................................................... 265
19. SSH Protocol.............................................................................................................................. 275