I have a nice 3 Meg service and the original 128 K ISDN. I'm looking for the best way to use the ISDN as backup when the 3M is down. The 3M has a block of routables and the ISDN router does NAT. If I put the ISDN's IP to the internet side and set-up everything works fine. If I put it in as an alias and use the 3M as default IP and gateway of course the ISDN does nothing. I can flip the IPs and gateway and have everything working (once I flip DNS). Any way to make it a bit more automatic or easier to flip (like by only changing the DNS?)?
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