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On my newly installed mandrake system I built a firewall using iptables that doesn't do much more (at the moment) than spoofing detection (and blocking/logging of course) and blocking everything from the outside that's not a related or established connection. I found lots of good stuff on firewalls to build a good one I think. I'll post it for review when I'm done. I built the scripts by hand btw since the standard mandrake (GUI) tools seem to break my network and it's not clear to me what they do exactly, so I don't know how to fix it.
Anyway, besides a firewall, what other things should I be looking for to secure my linux system from the internet? There are only two users on my home LAN (I and my girlfriend) so that's no issue. It's hard for me to make a start in the wealth of security info available, so I'd appreciate it if someone can point me to the most important things for securing my LAN/server from the internet. And what about intrustion detection systems? How to monitor the logs?
I know these are pretty broad questions, I need to know what shoudl be high priority.