What firewall do you use on your server?
 

yup, what firewall do you use on your server?

Are you talking about windows servers?!

On linux you do it manually through iptable / ipchains if you have a clue.There is no need for anything else.Clueless people may use APF or similiar.

hmm kk, I was talking about linux servers.
I bought a book about iptables so I think I will learn it soon.
Anyway, I tought alot of people was using firewalls on linux, but maybe not..

ipfw, is most popular, but if you are facing a big dos attack it aint gonna stop it :) only so much it can do. but its good for some things

Let me clear something up: firewalls are mostly useless

What firewalls do: block certain ports you specify

What firewalls can't do: save you from ddos attacks, prevent getting hacked, save any traffic (it's read out at the main switch,not at your server so it doesn't matter if you block anything).

If there aren't any lower priveleged users on your server who could probably run processes on unwanted ports there is no reason to block any incoming/outgoing ports.You'd just block ports you don't use anyway and that just doesn't make any sense.

We use Smoothwall, there is a free version and a corporate version, it just depends on what your looking for. It has held up very nicely for us for the past 2 years. Smoothwall