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Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one?
From: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Date: Wed, 28 Dec 2011 21:21:44 +0900

Iljitsch van Beijnum wrote:

Just to clear up a few misconceptions:

Only to add yet another misconception without any clearing up?

Router advertisements are exactly what the name suggests,
routers advertising their presence.
The first function of router advertisements is to tell
hosts where the routers are,

OK, so far.

so the hosts can install a default route.

WRONG.

Routers are not "a default route".

If a host receives RAs only from a router, the host can do
nothing other than installing the router as the default
router. If not, however, the host must directly be involved
in IGP activities, or, the following end to end argument
is applicable:

        The function in question can completely and correctly
        be implemented only with the knowledge and help of
        the application standing at the end points of the
        communication system. Therefore, providing that
        questioned function as a feature of the communication
        system itself is not possible.

                                                Masataka Ohta

PS

Granted that the notion of default router of IPv4 is no better
than that of IPv6.


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