using 1 3640 as the hub router; multiple 2610 routers as the spoke routers. running ODR on the hub and a static default route (0.0.0.0 0.0.0.0 ser0/0) on the spoke routers. Also using IP unnumbered on the 3640 WAN ports with them referencing the IP address of the eth0/0 port. I can ping across the WAN host to host but I can't ping the hub router from the spoke routers. Is it because of the IP unnumbered or what? Any help would be greatly appreciated.