How to set up a firewall ?

[moppy]

Is there any web teach you how to set up a firewall and what software can you use ?

[Bob-NB]

Here is a site with a good overview of firewalls.
www.telstra.com.au/pub/docs/security/800-10/ (http://www.telstra.com.au/pub/docs/security/800-10/)

This second site is entitled Internet FireWalls - Resourses
www.cs.purdue.edu/coast/firewalls/fw-body.html (http://www.cs.purdue.edu/coast/firewalls/fw-body.html)

I hope that they help.