Need to figure out a way to dynamically tell the best path (router is down), while using NAT. We have 2 Internet routers (1 for ISP-A, and 1 for ISP-B) which does nothing except static routes to the Internet. Have a Cisco router underneath leading into LAN that handles NAT. We NAT/route out to ISP-A statically right now, but need to add redundancy in to ISP-B (all 3 Cisco routers, 1841 will have 3 interfaces, 1 to LAN, 1 to ISP-A router, and 1 to ISP-B router). I can get EIGRP working between them, but as soon as I re-apply NAT statements on the 1841 EIGRP stops working. Anyone have a better solution or a way to fix this one?
(—) (—)
(ISP-B) (ISP-A)
(___) (___)
\ /
\ /
\ /
\ /
\ /
NAT out \(—)/NAT out
(1841 )
(___)
|NAT in
|