From: "Robert P. J. Day" <rpjday@mindspring.com> > just the other day, i was at a local LUG meeting and a guy was giving a > quick tutorial on iptables and displayed a sample rule file that contained > the rule: > > iptables -A FORWARD --destination 172.16.0.2 --destination-port 25 \ > --jump ACCEPT > > doesn't this represent an example of what i was asking about? a > reference to a port with no reference to protocol. well, a flipchart, whiteboard or video beamer presentation wont spit out any error messages... a real computer will do, and it will tell you that --destination-port is an invalid parameter in that case.. because you dont specify any protocol ;) iptables v1.2.6a: Unknown arg `--destination-port' Try `iptables -h' or 'iptables --help' for more information.
