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Date:      Wed, 2 Dec 1998 14:30:28 -0700
From:      Nate Williams <nate@mt.sri.com>
To:        Guido van Rooij <guido@gvr.org>
Cc:        Nate Williams <nate@mt.sri.com>, Daniel Eischen <eischen@vigrid.com>, dillon@apollo.backplane.com, hackers@FreeBSD.ORG, luigi@labinfo.iet.unipi.it
Subject:   Re: TCP bug
Message-ID:  <199812022130.OAA07967@mt.sri.com>
In-Reply-To: <19981202222702.A23308@gvr.org>
References:  <199812021626.LAA27156@pcnet1.pcnet.com> <199812021636.JAA06068@mt.sri.com> <19981202215730.B23018@gvr.org> <199812022104.OAA07720@mt.sri.com> <19981202222702.A23308@gvr.org>

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> > > In my previous mail I already stated why things can go wrong if the
> > > www server on the internet has a badly configured packet filter.
> > > In your case it seems that your router is badly configured. Does it
> > > filter out ICMP ICMP_UNREACH_NEEDFRAG pakcets from the ethernet to
> > > the ouside, but not from your router to the outside?
> > 
> > See my followup.  I don't filter out ICMP type 3 packets, but instead
> > allow them.  (I can't take any credit for this, it was part of the
> > firewall ruleset PHK gave me years ago...)
> 
> Yes I saw that too late. Anyway the bottom line is that the amount of clue
> on the internet is realling getting so low that new developments (well..new)
> like path MTU discovery can no longer be used. And when you try to
> convince the owners of the web site to change their packet filter
> (because usually it is theirs that is causing the problems) you easily
> give up after talking to the n-th clueless person.
> 
> It is my fear that the current cluelessness will have a severe impact
> on other new developments as well.

Well, thanks to you folks, my level of cluelessness is dropping. :)


Nate

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