netdev - Re: [PATCH net-next] IPv6: add option to use anycast addresses as source addresses in icmp error messages

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Date:	Tue, 14 Jan 2014 14:13:44 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Francois-Xavier Le Bail <fx.lebail@...oo.com>
Cc:	netdev@...r.kernel.org, Bill Fink <billfink@...dspring.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-next] IPv6: add option to use anycast addresses as source addresses in icmp error messages

On Mon, Jan 13, 2014 at 06:22:44PM +0100, Francois-Xavier Le Bail wrote:
> - Add "anycast_src_icmp_error" sysctl to control the use of anycast addresses
>   as source addresses for ICMPv6 error messages. This sysctl is false by
>   default to preserve existing behavior.
> - Use it in icmp6_send().
> 
> Suggested-by: Bill Fink <billfink@...dspring.com>
> Signed-off-by: Francois-Xavier Le Bail <fx.lebail@...oo.com>

Regarding the anycast patches, I contacted someone from IETF.

The number of sysctls needed to get introduced to have all the flexibility
regarding source address selection and don't break backward compatibility
concerns me a bit.

Especially on end hosts, where those switches will be important, I think we
really have to think about sensible defaults without breaking current
software.

I currently consider a per-address flag, if those anycast addresses
should be available in source address selection (also with an enhancement to
current IPV6_JOIN_ANYCAST logic).

Greetings,

  Hannes

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