Sprint IPv6

Gert Doering gert at space.net
Thu Oct 2 11:34:30 CEST 2008


On Thu, Oct 02, 2008 at 11:24:29AM +0200, Jeroen Massar wrote:
> >> Traceroutes work like a charm for proto-41, ayiya, openvpn, tinc,
> >> everything else I can name....
> > 
> > Well, actually, it doesn't.  You can see "before the tunnel it's fast,
> > after the tunnel, it's slow" - but there is no way to figure out 
> > at which point of the underlying non-tunneled infrastructure the bottleneck
> > might be.
> Of course, tunneling adds overhead and latency because of encap/decap.
> Those things tend to be difficult to determine.

That's not the point - the point is "tunneling hides topology", and if
there is a problem in that topology, with tunnels, your options to 
diagnose issues are reduced.

I'm not talking about "local" tunnels, skipping a non-IPv6-capable BRAS
or such, but about "packets enters upstream network in Frankfurt, Germany,
and reappears in some place in the US, and somewhere in between you 
have a bigger-than-normal latency jump and packet loss".  

Usually worsened by "when we run tests from our hotline desk, we cannot
see anything unusual".

Gert Doering
        -- NetMaster
Total number of prefixes smaller than registry allocations:  128645

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