> You cannot easily switch a router from using one WAN to another. You cannot easily do that with NAT either. Every single one of your TCP sessions will die,

> You cannot easily switch a router from using one WAN to another. You cannot easily do that with NAT either. Every single one of your TCP sessions will die, and likely every session going over UDP as well. Unless you're talking some special protocol specifically designed to handle clients changing IPs. Your machine may not notice, but the machines responding to your packets sure will.