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- Kernel level packet filtering - each incoming packet is checked
against a set of ``rules'' for acceptance or rejection
- Firewalling can be activated during install with RedHat 7.1
- Can be used in conjunction with tcpwrappers (redundant in
some cases, however)
- There are GUI tools to setup firewalls, however I will go over a
simple example using a shell script and the RedHat ipchains rc script
- First, the script to setup a very restrictive firewall (no
unsolicited incoming packets allowed):
Troy Carter
2001-06-03