On Tue, Sep 21, 1999 at 06:07:39PM +0200, Ignatios Souvatzis wrote:
> On Tue, Sep 21, 1999 at 08:59:39AM -0700, M Graff wrote:
> > Bill Sommerfeld <sommerfeld@orchard.arlington.ma.us> writes:
> > 
> > > Blocking all ICMP's breaks *all* known Path MTU discovery
> > > implementations, because PMTUD depends on receiving ICMP
> > > unreachable/"fragmentation needed but DF set" errors from the
> > > bottleneck router.
> > 
> > I thought we would back off to a smaller packet size if we "lost
> > contact" after N seconds.  Am I wrong?
> 
> No. We try bigger packets after N seconds, and use the next-hop MTU
> suggested by the ICMP packet too big messages.

well, at least that's what the RFC says. I didn't look at our code recently.
	-is

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