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To create a filtering firewall, you don't need any special
software. Linux will do. At the time of this writing I'm
using RedHat 6.1.
The bilt in Linux firewall have changed several times.
If you are using an old Linux kernel (1.0.x or older) geta
new copy. These older used ipfwadm from http://www.xos.nl/linux/ipfwadm/
and is no longer supported.
If you are using 2.2.13 or newer you will be using ipchaining
as developed by http://www.rustcorp.com/linux/ipchains/
If you are using the newer 2.4 kernal there is a new firewall
utility with more feachers. I will write about this soon.
If you want to setup a proxy server you will need one of
these packages.
- Squid
- The TIS Firewall Toolkit (FWTK)
- SOCKS
Squid is a great package and works with Linux's Transparent
Proxy feature. I will be describing how to setup this server.
AT the time of this writing, Network
Associates and Trusted Information System's (TIS) ,
have merged. So keep watching their web sites for more information
about changes. Mean while, the Tool Kit can still be had
at. http://www.tis.com/research/software/
Trusted Information System put out a collection of programs
designed to facilitate firewalling. With this toolkit, you
set up one daemon for each service (WWW, telnet ect.) you
will be using.
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