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Re: [v6ops] draft-gont-v6ops-ipv6-ehs-in-real-world: clarification text

Mark ZZZ Smith <markzzzsmith@yahoo.com.au> Sun, 19 April 2015 03:50 UTC

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Date: Sun, 19 Apr 2015 03:50:26 +0000
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
To: Nick Hilliard <nick@foobar.org>, "v6ops@ietf.org" <v6ops@ietf.org>
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Subject: Re: [v6ops] draft-gont-v6ops-ipv6-ehs-in-real-world: clarification text
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      From: Nick Hilliard <nick@foobar.org>
 To: v6ops@ietf.org 
 Sent: Saturday, 18 April 2015, 21:23
 Subject: Re: [v6ops] draft-gont-v6ops-ipv6-ehs-in-real-world: clarification text
   
On 18/04/2015 02:46, Fred Baker (fred) wrote:
> Well, question for you. If we follow RFC 2460, the router in the middle
> doesn’t know whether the header is there or not. The only systems that
> should have a performance impact are systems that parse to them or
> interpret them. 

layer 4 information is routinely parsed to extract n-tuples in order to
create lag / ecmp hashes for load balancing.  I.e. we have a requirement
for routers to interpret ipv6 packet headers on a per-hop basis, and make
consistent routing decisions based on this analysis.

/ That is what the flow label is for, and we should be encouraging vendors of both host OSes and devices which perform LAG/ECMP to be setting/using it for that purpose. Support for the use of it this way is in the current IPv6 node requirements RFC from 2011 (RFC6424).
/ Although it is disabled by default, the Linux kernel has supported automatic generation of flow label values since around August 2014 (sysctl net.ipv6.auto_flowlabels=1 to enable).
/ Regards,mark.

Nick



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