I have recently setup a second Inet connection to multiple carriers, 10.1.1.0/24 goes out Carrier A and the new IP range of 192.168.1.0/24 goes out carrier B.
We are migrating certain business applications to the new IP address space. In order to avoid any interruption in service I need to be able to provide the service on both old and new IP's concurrently.
I have the Old IP range comfing through carrier A and into a PIX.
The new IP range is coming through carrier B and into an ASA (5540).
I am running HSRP between the routers for failover, both routers are in the same BGP AS, and internet routing is working correctly for return traffic.
I currently have a NAT statement on the Old IP router, translating anything that comes for the old IP to the new IP.
The problem is I can only have 1 default gateway on my ASA, so if I set the Old IP router as the default gateway, the NAT translation works great but anyone who connects to the new IP address doesn't get a connection (the NAT translates it to the old IP going back out to the user)
If I set the new IP router as the default gateway, users can connect to the new IP, but the Old IP comes in, but doesn't get translated going back out.
Anyone know of a solution that could accomplish this?
Thanks in advance,