netdev - Re: [PATCH net-next v2] IPv6: add option to use Subnet-Router anycast addresses as source addresses

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Message-ID: <1388731742.39393.YahooMailBasic@web125506.mail.ne1.yahoo.com>
Date:	Thu, 2 Jan 2014 22:49:02 -0800 (PST)
From:	François-Xavier Le Bail <fx.lebail@...oo.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev@...r.kernel.org, "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 v2] IPv6: add option to use Subnet-Router anycast addresses as source addresses

On Fri, 1/3/14, Hannes Frederic Sowa <hannes@...essinduktion.org> wrote:

On Thu, Jan 02, 2014 at 10:19:24PM  -0800, François-Xavier Le Bail wrote:

>> Some setup may use a ping to Subnet-Router anycast
>> address and expect a reply to discover a unicast address
>> (not very secure, but ...).
>>
>> It is the reason why, I want to keep existing default.
 
> Yep, with pre-defined anycast address I actually meant the
> subnet router
> anycast address. We currently don't need to deal with more
> than that one:
> https://www.iana.org/assignments/ipv6-anycast-addresses/ipv6-anycast-addresses.xhtml
 
> As soon as this patch gets applied, we have to keep the knob stable
> in its semantic.  So my proposal would be to change the knob to just
> control the behaviour of ping replies and also change its
> name to reflect this.
 
> Leave datagram sending with specific anycast address as
> source just open and
> don't protect it with this knob. Would that be a plan?
 
But service discovery may be done also with UDP, so I see the knob as a router policy:
It enable or not anycast source.
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