I have a vpn server that has the only external IP address recognized by the clients I am making the VPN connection to. I did not set this up and have not been able to get the connection changed to accept our external ip. I need to have a backup server to make these VPN connections.
Does anyone know of a way to accomplish the task of making two servers appear to be comming from the same address, or making it look like they are using the same IP address for the outgoing address? The IP allowed by the clients is not the external IP of our router it is the IP of the server.
You could always look to a virtualzed solution where the server exists as a virtual host that is stored on SAN and then accessed from a front end VMWARE server. 2 Windows boxes, each running vmware server with access to a guest os on a SAN disk would provide the failover solution you are looking for without playing around with layer 3 networking.
HAve you looked at VMWARE or Virtual box or other virtualization packages?