Does the ampr gateway know about the networks routed via BGP? Maybe the mistake is that it consults the route tables in some order (first check if there is a BGP route, if so then route that way, then check if there is a tunnel route, if so route via tunnel).

This will fail on my test system because it has a /32 route via IPIP but the address is within 44.137.0.0/16 routed using BGP. The routing tables should be all merged into one so that it recognizes this /32 as more specific than the /16 and it routes via the tunnel not via BGP.

Part of our routing table:

default via 213.222.29.193 dev eth0 44.0.0.0/8 via 213.222.29.193 dev eth0  src 44.137.0.1 44.0.0.1 via 169.228.34.84 dev tunl0  proto ampr-ripd  metric 4 onlink 44.2.0.1 via 191.183.136.1 dev tunl0  proto ampr-ripd  metric 4 onlink

(213.222.29.193 is the router of our ISP)

Rob