netdev - Re: DSCP of ICMPv6 Echo Reply not copied from Echo Request

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Message-ID: <20140110044049.GC1012@order.stressinduktion.org>
Date:	Fri, 10 Jan 2014 05:40:49 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Simon Schneider <simon-schneider@....net>
Cc:	netdev@...r.kernel.org
Subject: Re: DSCP of ICMPv6 Echo Reply not copied from Echo Request

Hello!

On Wed, Jan 08, 2014 at 03:34:42PM +0100, Simon Schneider wrote:
> with kernel version 2.6.33.32, I noticed for ping6 that the DSCP value of an Echo Request is not used for the corresponding Echo Reply.
>  
> With ICMPv4, this is the case and I think it makes sense.
>  
> This is not mandated by ICMP RFCs, but there are good reasons to use the same DSCP in both directions.

Yes, IMHO we should do that, especially because DSCP is sometimes used for
policy routing.

> Is there a specific reason for this difference between v4 and v6?
>  
> Or was it even fixed in some newer kernel version?

Quick test showed no, I'll follow-up on this soon.

Greetings,

  Hannes

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