[squid-users] squid behind firewall with only port 8081 redirecting to squid

Hi forum,
new to squid I ran right at the beginning in a confusing configuration.

I have to set up squid on a machine behind a firewall.
Firewall is set up to serve port 80 to an other machine than the squid
server!!!

OK, the situation:

- squid 3 on a lenny debian server
- server with 2 network adapters
   - eth0 with 192.168.1.2 --> connected to firewall (fw = 192.168.1.1)
      -- port 8081 opened on fw and pointing to squid server (192.168.1.2)
   - eth1 with 192.168.3.2 --> connected to small workgroup.
      -- port 3128 used for squid proxy

My problem is, that I do not know how to setup the squid server correctly,
so that clients from workgroup can connect to internet (which later has to
be restricted).

My thoughts:
1. setting up eth0 and eth1.
    -- adding a route to eth1, to use eth0 as gateway
       route add -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.1.1 dev
eth0 (is this correct???)
2. using a prerouting wiht iptables??
   -- iptables -A PREROUTING -t nat -p tcp -i eth0 --dport 8081 -j DNAT --to
192.168.1.2:3128

This does not work. What could be wrong or better done?

Kind reagards and thanx

Kai

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