IP MASQ to a network that requires a PROXY

Here is the scenario.

We are tired of entering in proxy information in order to work on our
network. We always forget to remove the proxy when machines leave the
network, causing all sorts of connectivity headaches. So, I setup a
Linux Firewall. . . on one side we setup a simple 172.16.0.0/24 network
and on the other side we setup the outbound NIC with the proxy
information.

However, the problem we have is our little 172 network is working
well....... BUT we still have to enter in the proxy information in
order to browse the Internet and all services.

On the firewall, I setup a IP MASQ but is there something I can add so
all traffic will MASQ the proxy information as well? Seems like it
should be a simple fix, but it isn't. At this point, when a machine
shoots traffic out of our network, it is being NAT'd alright but that
PROXY info is not included in the NAT.

Hi,

Can't really understand what you want, but ill guess. Have you tried to
use proxy configuration scripts?

Bye,
Darjus Loktevic

Yes, I did attempt to set a Auto Proxy Config script, which does work.
However, there are still some programs we are using (i.e. PC-cillin)
which does not detect the auto proxy.

So, the script is OK, but not a total solution to our problems.

Here is what I suspect. We are running NAT. All traffic going out of
our network is showing up with the IP address on this firewall, BUT the
proxy information set on the outside NIC is not being passed along.

HOW do I get that proxy info that is set on the outside NIC passed
along?

Hi,

Have you seen (tried) this?
http://www.tldp.org/HOWTO/TransparentProxy.html

Bye,
Darjus Loktevic