There is a vpn site to site stablished between a 2821 router and a 1721 router.
1721 router only has a dsl wic with one public ip.
2821 router has a giga port which stablishes the first vpn and a dsl wic to configure if is possible the backup line.
I need to configure a backup line using the dsl wic configured into the 2821 to the dsl wic configured into the 1721.
The first vpn works fine, the second one is configured at both routers but using SDM to test the connection, all works fine except peer response... routing and firewalling works fine.