forbidden user proxy other

Eduardo Spremolla edspremolla at
Tue Aug 2 16:56:39 CEST 2005

If I understand correctly, you have a social engineering problem.
If you grant one user the rights to go to Internet, and him install a
wingate to let her pals use his access, no thing in the firewall will
detect it. You must prosecute or "advice" that user that sharing his
rights is against company policy.


On Tue, 2005-08-02 at 10:14 +0200, Jörg Harmuth wrote:
> bend chen schrieb:
> > hi,netfilter
> > 
> > 	I have manager some PC,some one can used my netfilter box access Internet,others can't access Internet.
> > but I find some PC installed proxy program (wingate\ccproxy...)  proxy some user's pc access Internet.
> > how can i set my firewall to forbidden user use proxy program?
> If I understand correctly, you want to allow proxy access for some users
> and other users are forbidden to use the proxy.If so, what about this:
> Structure your network, put allowed users in one network segment and
> forbidden users in a different segment. Then the following rules should
> get you started.
> iptables -P INPUT DROP
> iptables -P FORWARD DROP
> iptables -A INPUT -i lo -j ACCEPT
> iptables -A INPUT -m state --state ESTABLISHED,RELATED \
>    -j ACCEPT
>    --dport $PROXY_PORT -j ACCEPT
> [Some other rules you need]
> Finally I would like to suggest reading "man iptables" and this
> excellent tutorial by Oskar Andreasson:
> Good luck,
> Joerg

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