I had a similar issue with one of my tunnels, and it turned out to be bad hardware on one end.
Q On Mon, Feb 14, 2011 at 3:36 PM, schilling <schilling2...@gmail.com> wrote: > I have an ISR 871 behind Comcast residential cable modem with static > IP address, and have GRE tunnel back to our headend. Just plain > point-to-point GRE tunnel. Now it's flapping every 15 minutes, then > comes back up after 30 seconds. debug ip routing just showed tunnel66 > down and refreshed the routing table. There is no route > addition/removal or any interface down before the tunnel66 down. When > the tunnel is down, I am still able to ping the WAN gateway, but not > the WAN IP on the ISR871. > > #remote end > interface Tunnel66 > bandwidth 8000 > ip address 192.168.222 255.255.255.252 > no ip redirects > ip tcp adjust-mss 1436 > load-interval 30 > keepalive 10 10 > tunnel source FastEthernet4 > tunnel destination 192.168.253.19 > tunnel path-mtu-discovery > end > ip route 192.168.253.19 255.255.255.255 WANgateway > ip route 0.0.0.0 0.0.0.0 WANgateway 250 > ip route 0.0.0.0 0.0.0.0 tunnel66 > > #head end similar. > > Just upgraded the ISR871 to be running latest > c870-advipservicesk9-mz.124-24.T4.bin, but the issue persists. We > already tried reboot the modem and reboot the switch. > > Any insight? > > Thanks, > > Schilling > _______________________________________________ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/