FreeBSD 6.3 gre and traceroute

Julian Elischer julian at
Wed Nov 12 11:55:11 PST 2008

Stephen Clark wrote:
> Hi,
> When I run traceroute thru a gre it doesn't seem to decrement the
> ttl, so I get * * * for that hop. Can this be fixed?
> Thanks,
> Steve

you will need to define the setup and question better.

TTL is controlled by the IP stack which is unaware of which interface
it came in on and doesn't care which interface it goes out on. That 
includes GRE interfaces.. Is it freebsd at both ends?

BTW * * * would come from an EXTRA decrement

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