Firewall Questions

[kevin.kempter at dataintellect.com]

Hi All;

For several years now I've been using the Astaro Firewall solution for my home 
network (http://www.astaro.com/). It requires it's own box with 2 nic cards 
and serves up IP's for the network behind the firewall. It's been a great 
solution however I wonder if there is an open source equivalent available. I 
never use the Fedora firewall because I'm almost always behind the main 
firewall on my home network or behind some corporate firewall.

I would like to find a tool capable of the following:
1. the ability to act as a domain firewall (maybe domain is not the correct 
term?) with the ability to serve up IP's for the users behind the firewall 
and provide access both to the internet and to each other within the network

2. The ability to provide some sort of surf content filtering to keep my 
teenagers from being exposed to crap via the web

3. th ability to setup M$ style vpn access

4. something that's easy to administer

5. we generally are a Linux - only network save a few dual boot boxes for the 
sole purpose of playing multi-player games. It would be nice if I could 
prohibit any of the M$ installs from ever visiting the web but at the same 
time allow within-network access to each other so multi-player games would 
still work without acquiring an M$ based virus for every 10 minutes of game 
time.

Thanks in advance for any suggestions...