Main office access to DR site using NAT

We have a 10.x network at the main office and the same 10.x network at our DR site. The same ip network is required by our host system for DR to work. We have two 3600 Cisco routers at the DR site. One is doing NAT for the 10.x network and I can ping the NAT addresses. The other is functioning as bridge of sorts and I can ping the main nework. There is a 192.x network between the DR and the branch network. What command in the Cisco’s am I missing to be able to ping from Main office to the NAT addresses of the DR site?