Is it possible to use two VPN or MLPPP routers to aggregate, load balance, or fail over between WAN connections from a number of different providers?
Two conditions:
1. We need to keep the external IP constant so we can SSH/VPN in and out, run Exchange, etc.
2. No BGP. That's been the answer to similar questions, but a /24 IP block is not sensible for an office of twenty people.
I'm in an area where T1s and the like are insanely expensive, but WiMax, WiFi and DSL are available. We also get plenty of thunderstorms, so we can't rely on WiFi or WiMax alone.
I currently use MLPPP over multiple DSL lines from the same provider, but that doesn't give us enough bandwidth.
Best Answer
You can only do transmit load balancing over the links. Without some form of coordination (ie BGP) others have no way is seeing the multiple return paths.