On Sat, 2004-11-27 at 23:17, pravin rane wrote: > That is right but only when all clients are using my > DNS server. I will not be able to block MX requests if > they are using some other DNS servers which are > out-side of my network and I can not force my clients > to use only my DNS server. iptables -t nat -A PREROUTING -i $INSIDE_IF -p udp \ --dport 53 -j REDIRECT --to-port 53 or some variant thereof... -j -- "Lisa, if the Bible has taught us nothing else, and it hasn't, it's that girls should stick to girls sports, such as hot oil wrestling and foxy boxing and such and such." --The Simpsons