[c-nsp] Strange ICMP/GRE problem

[Rodney Dunn]

Are you running GRE keepalives?
Crypto?

tunnel drops without those only happen when the source interface
goes down or you have no route to the tunnel destination.

On Wed, Jan 24, 2007 at 01:00:33PM -0800, Roy wrote:
> This one has me stumped a bit. 
> 
> I have a 1721 with two ethernet ports running 12.3(18).  The Internet is 
> connected to the Ethernet WIC.  It has NAT enabled and a GRE tunnel.
> 
> In the failure mode, the tunnel drops and the router stops responding to 
> pings from the Internet.  However you can still telnet into the router 
> from the Internet. 
> 
> The log shows no events when this occurs either.  The ICMP counters in 
> "show ip traff" seem to be incrementing as expected.
> 
> Any pointers would be appreciated.
> 
> Roy
> 
> 
> 
> 
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