forcing a user through squid on local system

[Kumar Swamy]

Hello,

This is my first post in this mailing list.
I have a peculiar problem. The gateway of my small network is a linux
box with Squid running in a transparent mode.
This transparent proxy can force all the systems behind it to go
through Squid.

The problem now is to force users working locally on
the proxy to go through Squid because I cannot give the command:
iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-port 3128
as the request from Squid also would go through the OUTPUT chain in
the NAT table.
Any advice would be helpful.

TIA.
Swamy