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Date:      Wed, 2 Dec 1998 10:20:54 -0700
From:      Nate Williams <nate@mt.sri.com>
To:        Ruslan Ermilov <ru@ucb.crimea.ua>
Cc:        Thomas David Rivers <rivers@dignus.com>, eischen@vigrid.com, nate@mt.sri.com, dillon@apollo.backplane.com, hackers@FreeBSD.ORG, luigi@labinfo.iet.unipi.it
Subject:   Re: TCP bug
Message-ID:  <199812021720.KAA06413@mt.sri.com>
In-Reply-To: <19981202185808.A4604@ucb.crimea.ua>
References:  <199812021636.JAA06068@mt.sri.com> <199812021647.LAA09094@lakes.dignus.com> <19981202185808.A4604@ucb.crimea.ua>

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> >  On my internal network; I can't get to some sites (www.aol.com being
> > the best example.)
> > 
> >  But, If I'm on the gateway machine - it has no problems getting there.
> > 
> >  Thus, I was implicating natd.
> > 
> >  And - it so happens; my connection is a SL/IP connection, and my MTU
> > is 552.
> 
> Some sites block ICMP and thus break PMTU discovery.

Umm, if this is the case, why would we be having a problem with a
network segment with a smaller MTU not being able to send packets to a
network with a bigger MTU?  It would seem to me that the small MTU
network connection would be the one having the problems, not the larger
MTU network connection.


Nate

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