Originally Posted by blackfish
The other problem i have is that the two networks this server is between are running on two completely different subnets. This means in effect i need to setup a bridge. I thought that ip tables would be most appropriate but again not sure how it can be done.
Sorry, Blackfish, but I'm not sure about the authentication question. On the network issue, in my mind, the best way to handle the two different subnets would be with two nic's and iptables. Set one nic to handle the "requesting traffic", the other will have the gateway (sounds like the Border Manager address).
A single nic can be dual-homed (assigned to two networks).
For more info on iptables and nat: http://tldp.org/HOWTO/IP-Masquerade-HOWTO/
Best to you and your project...