I have a weird problem here. I am doing the tunneling on 837 and 2621. I used gre ip mode. but after sometimes the tunnel stops responding I can't ping the tunnel ip address interface from 837 to 2600 or 2621.then I changed the tunnel mode to be ipip mode then I can ping. But then the same problem happened again...I have to change another mode which is gre ip mode then I can ping and it happened i have to do the same thing to make it works.Any idea what went wrong ?
I am having exactly the same problem. I have two plain GRE tuneels created from 1721 to 2 7206 routers. The tunnels stop passing traffic and i am not able to ping the remote site. No error messages nothing. Do you get any solutions on this problem?
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...