> My platform is Redhat 7.2 in default congiguration. > > While I execute "iptables -nvL input" > > I got the following message on screen: > > > [root@xxxxxxxxxx account]# iptables -nvL input > iptables: Table does not exist (do you need to insmod?) > > why? how to find the talbe? does it need a special patch? Try iptables -nvL INPUT Default chains are in capital letters. By the way : Reading the man page would have answered this. johannes walch