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Subject: Re: Traceroute via CIPE
From: Ganesh Sittampalam <ganesh,AT,earth,DOT,li>
Date: Tue, 15 Jan 2002 20:33:01 +0100
In-reply-to: <20020115191241.7bc61348.chris@wapmx.com>

On Tue, 15 Jan 2002, Chris Wilson wrote:

> I've got a couple of CIPE links up and running to one of my servers, using
> pkcipe. I've noticed that I cannot run "traceroute" through the link - any
> idea as to why this might be? Ping, also icmp, doesn't seem to have any
> problems.
> 
> Any idea why?

Set "cttl 64" in all your CIPE option files. I don't recall exactly what 
the problem is, but it's something to do with the relationship between the 
TTL of the carrier packets and the TTL of the payload packets meaning
that they get dropped without the appropriate ICMP getting back to 
traceroute.

Cheers,

Ganesh





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