I have been looking at several scripts checking the default policies on them. Some include items that others don't. Oscars tutorial doesn't cover all of these compared to Ziegler's book. I have been wondering if the following covers ALL built-in chains? iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP Ziegler's book states that it should be this (it was never put in these words but this is what I am gathering from my reading): iptables -t nat -P PREROUTING DROP iptables -t nat -P OUTPUT DROP iptables -t nat -P POSTROUTING DROP iptables -t mangle -P PREROUTING DROP iptables -t mangle -P OUTPUT DROP iptables -t filter -P INPUT DROP iptables -t filter -P OUTPUT DROP iptables -t filter -P FORWARD DROP The last seems to be the most thorough but i cant find anywhere that covers this in detail. Are these all of the built-in chains? Robert Wideman
