Hello, On Thu, 22 Jul 2004 10:43:07 +0500 Askar Ali Khan <askarali@xxxxxxxxx> wrote: > Or we are unnecessary repeating it on some chains/tables. Yes, here: > iptables -t nat -A PREROUTING -p TCP -s 0/0 -d 0/0 --dport 135:140 -j DROP > iptables -t nat -A PREROUTING -p UDP -s 0/0 -d 0/0 --dport 135:140 -j DROP You already have that in your INPUT chain. Always stick to the 'filter' table for filtering. I also think Windows uses only UDP (quite sure) on ports 137:138 (not sure). Why don't you go for a default DROP policy with ACCEPT rules? Kind regards, Leslie