How can I install/configure an Xproxy/Xfirewall?

[Pedro Guerreiro <pmguerre@ualg.pt>]

Hello.

I'm having some trouble installing an Xproxy in my
system, can someone give some (ANY) ideas?

This is what I want to do: I have a COW (Cluster of
Workstations) in a private subnet, and a gateway to
connect them all to the outside world (in this case our
Faculty net). I want to give access to the COW to
all/some of our teachers through the gateway, using X.
As 99% of them are using some version of Windows
(95,98,NT,2000), the connection will be through some X
client, like X-Win32, or similar.

I've installed xdm on the gateway machine, and configure
it to serve xdm through the net using XDMCP. This way
the clients can connect to the gateway machine and the
xdm login screen is shown on the client and allows the
user to login. But this is not what I want, because I
don't want the user to login to the gateway, but to
some/any workstation inside the COW.

I've played around with lbxproxy/xfwp/proxymngr and
can't figure how they are supposed to work.

So this is what I want: The client (mainly using
Windows) should connect to the COW. But between them is
a gateway/firewall. How can I configure the gateway so
that is allows the X connections to pass through?

Please don't say RTFM, as I've read all I've found. If
anyone can give more specific answers, I would be very
gratefull.

Thanks.
pmguerre