Subject: Re: ipv6 stack seems to forget to send ACKs
From: Mika Liljeberg <mika.liljeberg@welho.com>
To: Wichert Akkerman <wichert@wiggy.net>
Cc: linux-kernel@vger.kernel.org, Maciej Soltysiak <solt@dns.toxicfilms.tv>,
   netdev@oss.sgi.com
In-Reply-To: <20030108170139.GL22951@wiggy.net>
References: <20030108150201.GA30490@wiggy.net>
	 <Pine.LNX.4.44.0301081718340.4542-100000@dns.toxicfilms.tv>
	 <20030108170139.GL22951@wiggy.net>
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Date: 10 Jan 2003 00:12:33 +0200
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Hi Wichert,

Looking at your trace it seems that the receiving machine is dropping
all packets that do not have traffic class set. Note that all segments
received with [class 0x2] get properly acked. The others probably don't
get to TCP at all. You might want to check your filters and QoS
policies.

BR,

	MikaL


On Wed, 2003-01-08 at 19:01, Wichert Akkerman wrote:
> Previously Maciej Soltysiak wrote:
> > I seem to be getting better results than you, i think that it is not an
> > issue of ipv6 implementation but simply the case of time sensitive
> > traffic fighting with other Internet traffic over tunnels through ipv4
> > networks.
> 
> Actually, I don't follow this. How could any kind of traffic shaping
> result in my client not sending ACKs, which is what the tcpdump
> seems to indicate? I can understand packets being dropped which
> would result in retransmits, but that is not the case here.
> 
> Wichert.
> 
> (usual I'm-no-network-guru-and-might-be-misreading-things disclaimer here)