Hi all,

I am planned to set up a transparent proxy server using squid on a Fedora Core 7 or 8 or 9 or 10.
I have three different ISP connections which is set up as
gateway1,gateway2 and gateway3.

I would like to set up a fail over environment in such a way that if
any one of the gateways doesn't work, it should automatically switch to any of the other available gateways.

On the workstations,the users should be facilitated to change the gateway alone to access different ISP connections.

If possible authentication shall be provided based on the individual system network card Mac Address rather than IP.(All the workstations on the LAN are Windows XP SP2 currently assigned with static IP addresses)

Hardware environment:
I have a dell Power edge sc430 server with Pentium D processor and 4GB RAM and 2 onboard NICs. 3 routers provided by the ISPs, 5 Switches)

(I have already tried IPCOP kernel under a test environment. Is it possible to set up ISP failover in IPCOP. If yes, how to set up(a How-To guide will be helpful). How many NIC cards required on a single server for all the three ISP connections for Input & output connections)

Regards
Venkat