We have an IPSec tunnel that connects to a firewall that has a static NAT address on the border router. When we have one router dual homed to two ISP's with T1 connections it translates perfect. When we change this to two routers that have a seperate connection to the ISP with I-BGP it stops working. The NAT translation will not translate coming back in. I have attached the running configuration of one of the routers to give you an idea. The I-BGP is working great and normal traffic will pass through fine. I have attached the configuration of the router with the ISP that has the best route to the destination of the tunnel. Also, the other router is almost identical except a few different IP's.