netdev - Re: IPv6 path MTU discovery broken

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Date:	Mon, 7 Oct 2013 16:32:06 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"Steinar H. Gunderson" <sgunderson@...foot.com>
Cc:	netdev@...r.kernel.org, edumazet@...gle.com, fan.du@...driver.com
Subject: Re: IPv6 path MTU discovery broken

On Mon, Oct 07, 2013 at 10:32:28AM +0200, Steinar H. Gunderson wrote:
> On Mon, Oct 07, 2013 at 05:09:10AM +0200, Hannes Frederic Sowa wrote:
> > Could you try to check (with e.g. nstat) if any of the following counters
> > change if the icmp messages hit the host?
> > 
> > TcpExtOutOfWindowIcmps
> > Icmp6InErrors
> > TcpExtTCPMinTTLDrop
> > TcpExtListenDrops
> 
> Icmp6InErrors is 0, so that's not it. How do I find the Tcp* counters?
> None of them show up in nstat, although other Tcp* counters do.

Strange, I have them in nstat:

$ nstat -z | egrep  '(TcpExtOutOfWindowIcmps|Icmp6InErrors|TcpExtTCPMinTTLDrop|TcpExtListenDrops)'
Icmp6InErrors                   0                  0.0
TcpExtOutOfWindowIcmps          0                  0.0
TcpExtListenDrops               0                  0.0
TcpExtTCPMinTTLDrop             0                  0.0

Otherwise you can manually extract them from /proc/net/netstat.

Greetings,

  Hannes

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