[squid-users] Transp. Proxy, Browser and VPN Client on the same box?

Hi,

I've got some problems beside the normal way. The machine (kernel 2.4.16)
ist connected to the Internet through a VPN connection (Cisco, IPsec).
On this machine I set up Squid with the default config that came with
the distribution (SuSE 7.2) and configured Mozilla to use the Proxy on
Port 3128. That worked find.
Now, I want to force the users to use the proxy. That means to setup
squid as a transparent proxy (I read the mini-HOWTO) and therfore
redirect the local TCP traffic on port 80 to the squid port 3128 with
iptables.
And here is my problem: I'm not firm in setting up filtering rules and
so I'm asking me if it's possible to get this szenario to work?

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT
--to-port 3128

eth0 has the ip-adress 10.73.52.246 and the vpnclient reports me
10.73.200.254.

Are there any hints? What should I test first?

thx
Dirk

-- 
Dirk-Michael Wagner *** Wagner.Dirk-Michael@web.de
Open Minds. Open Sources. Open Future. - Linux!