I am pretty new to linux and have been playing around with setting up a firewall, this is what i have come up with so far

#!/bin/sh

/sbin/iptables -N BORG
/sbin/iptables -A BORG -m limit --limit 2/s --limit-burst 20 -j LOG
/sbin/iptables -A BORG -j DROP

/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A INPUT -i lo -j ACCEPT
/sbin/iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A INPUT -j BORG

any suggestions on how to close some security holes wll be apreciated..

Thanks

Please see the sticky thread on top of this forum, the 2nd post, under "Netfilter" you'll find some tutorials and examples (esp. the linuxgurus site).

Thanks for the help!!!