Sprint IPv6

[Gert Doering]

Hi,

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

SpaceNet AG                        Vorstand: Sebastian v. Bomhard
Joseph-Dollinger-Bogen 14          Aufsichtsratsvors.: A. Grundner-Culemann
D-80807 Muenchen                   HRB: 136055 (AG Muenchen)
Tel: +49 (89) 32356-444            USt-IdNr.: DE813185279
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 305 bytes
Desc: not available
Url : http://lists.cluenet.de/pipermail/ipv6-ops/attachments/20081002/edaed3df/attachment.bin