Can't get --dport to work

["Joel Lindsay" <joel@xxxxxxxxxxx>]

Hi,

At one time I had this working.  I could match on the ports and deny http 
traffic from certain interfaces.

Now I get an error message and I am not sure what is causing it.  Can anyone 
help?

# iptables -A OUTPUT -i ath0 -p tcp --dport 80 -j ACCEPT
iptables v1.3.6-20061129: Unknown arg `--dport'
Try `iptables -h' or 'iptables --help' for more information.


Thanks,

Joel Lindsay, B.Eng
Project Engineer