Date: Sat, 04 Mar 2000 02:18:15 +0000 From: Brian Somers <brian@Awfulhak.org> To: Dermot McNally <dermo@mcnally.de> Cc: Brian Somers <brian@awfulhak.org>, Dermot McNally <dermot@mcnally.de>, freebsd-net@FreeBSD.org, peter@FreeBSD.org, jkh@FreeBSD.org, joe@FreeBSD.org Subject: Re: NAT issues with ppp - a fix Message-ID: <200003040218.CAA02929@hak.lan.Awfulhak.org> In-Reply-To: Message from Dermot McNally <dermo@mcnally.de> of "Thu, 17 Feb 2000 01:40:52 PST." <Pine.BSF.4.21.0002170138460.7777-100000@shell20.ba.best.com>
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Hi,
Because of a recent change in the way I connect to the net
(PPPoUDPoPPPoISDN), I'm now seeing this problem !
Can you try the attached patch ? I believe this fixes the problem !
For those that have forgotten this thread, the issue is with
fragmented packets going through ppps NAT implementation. Peter was
the first to point out an occasional error message saying ``Problem
with IP header length''. It turns out that the bug is a couple of
lines above (see the patch), and was worsened (made consistent enough
to make a given tcp/udp session freeze) by my recent mbuf memory
allocation optimisations !!!
Thanks for any confirmations.
Jordan (cc'd) is in Holland at the moment, so I suspect nobody's
going to approve this for 4.0 and it'll have to stay as
queued-patch-#16 here on my laptop - unless I can collar him as
he passes through the UK on Sunday !!!! Any news Joe (cc'd) ?
> On Thu, 17 Feb 2000, Brian Somers wrote:
>
> > If it still happens with the latest verison, can you also try
> > decreasing your network MTU to 1492 (or maybe even 1400 for kicks).
> > This would stop IP fragmentation - it shouldn't make a difference,
> > but, well....
>
> I've just realised that you're talking about my inside MTU - I haven't
> even touched that yet. I'll try it.
>
> Cheers,
> Dermot
--
Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org>
<http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org>
Don't _EVER_ lose your sense of humour !
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