netdev - Re: Subnet router anycast for FE80/10 ?

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Message-ID: <OFC7C1D462.090FDB12-ON8825793C.005F496E-8825793C.00607E99@us.ibm.com>
Date:	Wed, 2 Nov 2011 10:33:58 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	Andreas Hofmeister <andi@...lax.com>
Cc:	netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: Subnet router anycast for FE80/10 ?

netdev-owner@...r.kernel.org wrote on 10/31/2011 01:22:41 PM:

> But then, FE80/10 is not actually supposed to be routed at all and so a 
> router cannot not really be a router for that particular subnet ?
> 
> Or is "FE80::" just supposed to be the anycast equivalent for the "all 
> routers" multicast address ff02::2 ?
> 
> Maybe someone on this list could enlighten me.

I think it's just a matter of not making an exception for LL addresses.
Forwarding is for the interface, not for individual prefixes.
If forwarding is enabled on the interface, anycast addresses for all
its prefixes are added.

It could be used to send to "any router" on a subnet, of course.

                                                        +-DLS

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