--Also try ' nmap localhost ' and ' less /etc/services ' to see which programs run on those ports. You can also use ' lsof |grep 68 ' to list open files/ports.

--I'm concerned if you disable port 68 (bootpc) your DHCP server will stop working, but I don't know that much about DHCP or firewalling.

(COMPLETE IPTABLES NEWBIE QUESTION) - After skimming thru the iptables tutorial and understanding about 2% of it, what about limiting your DROP rule to interface ppp0?

Quote Originally Posted by Stephen
Try /sbin/iptables -A INPUT -p tcp --dport 68 -j DROP a good tutorial and sample script are here and there are a couple of other firewalls available such as Guarddog and Bastille-Linux in Debian.