IPSec tunnel latency

Howard Lowndes howard at lannet.com.au
Wed Jan 16 10:28:13 EST 2002

I doubt that it is fragmentation.  Both of these are ping packets with very
small data loads (8 bytes).  The tunnelled packets would have an extra header
but I doubt that they would be bigger than 50-60 bytes even then.

Quoting Alex Satrapa <grail at goldweb.com.au>:

> On Wednesday, January 16, 2002, at 06:43 , Howard Lowndes wrote:
> > The only explanation I can come up with is that the PSTN modem is
> really
> > barfing about handling protocol 50, or something in the circuits in
> > between is barfing about protocol 50.
> >
> > Would anyone care to make a stab in the dark on this one before I do
> a
> > 250km trip to replace the modem.
> My stab in the dark - since the latency is almost doubled, could you be
> experiencing IP fragmentation?
> Try changing the MTU to about half, if possible, for that link - or just
> try to figure out what the minimum MTU is for the whole connection.
> Alex

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