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Date:      Sun, 20 Mar 2011 21:08:39 +0100 (CET)
From:      sthaug@nethelp.no
To:        sclark46@earthlink.net
Cc:        freebsd-net@freebsd.org
Subject:   Re: ipv6, stateful config and non-default prefixlen
Message-ID:  <20110320.210839.74676285.sthaug@nethelp.no>
In-Reply-To: <4D8642FF.6050400@earthlink.net>
References:  <20110318.195636.74687196.sthaug@nethelp.no> <4D846A9C.7000705@zhegan.in> <4D8642FF.6050400@earthlink.net>

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> How does a router that is using dhclient to get delegated a address 
> prefix from an upstream router obtain its default route, since dhcpv6 
> can't provide a default route.
> And since it is a router it can't get its default route from router 
> advertisements from the upstream router?

It behaves both as a host and as a router:

- As a host it receives a default route from RA from its upstream
router - and it can also receive an address (IA_NA) or a prefix
(IA_PD) using DHCPv6.

- As a router it can send RA on its LAN segment(s), and it can also
act as a DHCPv6 server. In principle it could subdivide a prefix
obtained with DHCPv6 IA_PD (for instance a /56) into suitable /64
prefixes and announce these on separate LAN segments - thgough I
don't know of any boxes that do this automagically today.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no



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