Hello!

I'm planning to setup proxy server.
The situation as follows:
1) I have mail server, which works also as firewall and router. This mail server has 2 NIC, one connected to ADSL modem, 2nd to HUB, allow other computers in the LAN to go to internet
2) As the situation is that I can't setup proxy server in the mail server, I have to setup proxy server separately.
3) You can see the picture following the link, I want other computers in the LAN to go to internet trough the proxy server, and only proxy server has to go to internet through the mail server, i.e. for all computer in the lan gateway is proxy server with ip 192.168.0.2, and for proxy server gateway is mail server with internal ip 192.168.0.1.

http://tenzan.web.kg/proxy_server.jpg

The question is:
1) Is is implementable what I proposed above?
2) Or I have to put mail server behind the proxy server, in that case I will need to insert one lan card more for adsl modem?

Thanks,
askar

Is is implementable what I proposed above?
Yes it is. (BTW, this is more a question for the Linux - Networking forum). I would run as little on the fw/rtr as possible to minimise exposure. If you do need to provide publicly accessable services I would stick an extra card in the fw/rtr and run then separate from a DMZ. Depending on what kind of proxying you gonna do and if you got enough RAM, spose you could heap SMTP and proxy onto one box.