we have a seconary internet connection as a backup connection.

All our win xp clients connect through a squid proxy running on SLES 9 to
the internet.

The secondary internet connection is routed through another SLES 9 running
an identical squid configuration.

With ZEN group policies we have assigned the proxy to our clients. Now we
would like to assign the second proxy to the clients so that they connect
through that one in case the first proxy goes down.

Can that be done?