[pptp-server] GRE traceroute for Win*?

[David Luyer]

Kevin wrote:
> any reason not to run the gre traceroute from the poptop server? the path
> should be the same both ways right?

You're assuming symmetry on the Internet?  You couldn't be further from the 
truth in many cases :-)  If it is an asymmetrical case, you may need to run
the GRE traceroute in both directions to work out which direction is not
working (since the return ICMP time-exceeded packet should not be blocked).
Even if it isn't asymmetrical you might still need to do the same if the
blocking itself is in one direction only.

eg, where I work we typically use outgoing paths through 6 main providers
and incoming paths through 3 main providers, and the main incoming provider
is not one of the outgoing providers.  Only in one location do we use the
same incoming and outgoing provider, and that provider don't in turn use the
same providers for their incoming vs outgoing traffic.

Easiest thing might be to take a laptop with Linux on it to the site if the
problem is only evident on the client to server direction.

David.
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