netdev - Re: Why does IPV6 link local address advertised as /64?

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Message-Id: <200811120944.20079.remi.denis-courmont@nokia.com>
Date:	Wed, 12 Nov 2008 09:44:19 +0200
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	"ext Stephen Hemminger" <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Why does IPV6 link local address advertised as /64?

On Wednesday 12 November 2008 06:49:06 ext Stephen Hemminger, you wrote:
> It seems to make more sense to have only the actual host (ie /128)
> on the link-local address or is there some other purpose to
> using a /64?

For the same reason that IPv4 link-local (169.254/16) addresses are /16 rather 
than a /32. There are LINK-local addresses, not HOST-local addresses - you 
must be able to talk to other nodes on the link with them.

-- 
Rémi Denis-Courmont
Maemo Software, Nokia Devices R&D
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