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Subject: Re: can't transmit files larger than about 1K to remote machine
From: Cheng-Jih Chen <cjc,AT,cjc,DOT,org>
Date: Thu, 19 Oct 2000 23:07:00 +0200
In-reply-to: <Pine.LNX.4.02A.10010192110450.8163-100000@erwin.ash.de>

Thank you!  ICMP filtering was the problem.

On Thu, 19 Oct 2000, Hauke Johannknecht wrote:

> On Thu, 19 Oct 2000, Cheng-Jih Chen wrote:
> 
> > Thanks.  The smaller MTU seems to work.  At least somewhat: the linux
> aehm, lowering the MTU should be considered a part of debugging,
> not of the solution.
> 
> > Oh, I have ip_always_defrag set, but I'm not masquerading, so it shouldn't
> > have any affect.
> well. it could even worsen the situation.
> 
> you should check if you filter ICMP somewhere. most MTU-problems
> are caused this way. filtering ICMP breaks PMTU-discovery.
> so you should disable PMTU-Disc or let the ICMP-frag-needed pass.
> 
> Gruss,
>   Hauke
> 
> -- 
> Hauke Johannknecht        Berlin / Germany        HJ422-RIPE
> Use PGP ! -> lynx -dump http://www.ash.de/ash.asc | pgp -kaf
> 
> 
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