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Date: Mon, 29 Jan 2018 12:38:48 -0800
From: Stephen Hemminger <stephen@networkplumber.org>
Message-ID: <20180129123848.64796ce6@xeon-e3>
In-Reply-To: <8ada1d8f-369e-b8b8-48c1-362500e37e8f@man.szczecin.pl>
References: <CA+k9h3O2OFKjoPqhN4LBnMODX=M607nwGfLiaAm+BB4T4mmEDw@mail.gmail.com>
	<20180128142826.15c9fcbf@xeon-e3>
	<8ada1d8f-369e-b8b8-48c1-362500e37e8f@man.szczecin.pl>
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Subject: Re: [Bridge] ssh connection not working when ssh server is behind a
 linux bridge
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To: Seweryn Niemiec <ser@man.szczecin.pl>
Cc: bridge@lists.linux-foundation.org

On Mon, 29 Jan 2018 10:42:19 +0100
Seweryn Niemiec <ser@man.szczecin.pl> wrote:

> On 28.01.2018 23:28, Stephen Hemminger wrote:
> > These symptoms sound like an MTU mismatch.
> > The padding is not related. More likely, the issue is that one side
> > is sending a larger frame than the MTU of the underlying interface.
> > Since the bridge is a pure layer 2 interface, it has not choice
> > but to drop any frame where the size is greater than the MTU.  
> 
> I have a similar problem (same infrastructure and same symptoms) but with random
> occurrence. Ssh session hangs randomly, usually before the login prompt is
> shown), sometimes a bit later, sometimes after few days. I have MTU 1500 on all
> interfaces taking part in communication. Ping of any size works and as far as I
> tested, HTTP communication too, but there are problems with HTTPS.
> 

If you see that, it usually is some middlebox in the way intefering with packets.