I have a ISA server with four interfaces. One is LAN, another is DMZ. The third is of course the internet interface. This is all working fine.
I have two SDSL modems and what I want to do is to have site-to-site VPN go through one interface and all other traffic through the other. Physically, there is no problem, of course. But after adding the fourth interface, I'm kinda puzzled on how to configure this. I have two internet connections so I also have two gateways to set up. I want to use a specific internet interface based on the protocol used.
Is this even possible? How would I do it? If this is not possible, what would be a good alternative?