Firewall Questions on Ubuntu

[karigna]

I just loaded Ubuntu and love it although I have some newbie questions:

I need to allow remote connects from my local lan to the Ubuntu machine but
am not good at configuring the firewall. I've used Firestarter in the past
but am not able to install it or Fwbuilder as I get the following error on
running configure on the source "/lib/cpp" fails sanity check. Can someone
give me the iptables commands to open port 3306 from a 192.168.0.x machine?

If the two gui firewalls are the problem is there another option. BTW the
versions I used were 0.8 for Firestarter and 2.0.3 for FWBuilder.

Thanks.

Kevin