how to prevent a user from accessing the inernet from my machine

[alaadin@xxxxxxxxxxx]

Hello,

if i have a user on my machine

and i do not want him to access the internet from my machine ..

how can this be done ?

when i do

[root@Shell iptables-1.2.11]# iptables -A OUTPUT --uid-owner
his-number-uid -d 0/0 -j DROP

iptables v1.2.11: Unknown arg `--uid-owner'
Try `iptables -h' or 'iptables --help' for more information.

it gives me this error .. ?