We replaced the router, which upgraded the OS from v12.2 to v15.0. We duplicated all the addressing and routing statements from the old router. Now the VPN still connects but the outside host can't ping the inside host anymore. The outside host can't ping any further than the inside interface of the router (10.4.1.1). The Router can ping the outside host, so I know the tunnel is up.
I suspect there is a difference in the OS versions that is tripping us up. Perhaps in the way that we have reused the 10.x.x.x address range?
We replaced a router with upgraded OS and VPN stopped working
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