Re: [NDP] Router autoconfiguration with RS/RA

On Fri, 6 Jun 2008 14:28:51 +0200, "Silviu VLASCEANU"
<silviu.vlasceanu <at> gmail.com> wrote:
> Why wouldn't a router be authorized to send Router Sollicitation
messages?
> Moreover, why couldn't a router autoconfigure its egress interface based
> on Router Advertisements received on this interface?

That would be useless. Lets ignore security issues. And lets even assume a
hierarchical network.

A router could learn what is "upstream" router is using RS/RA. But what's
the point? It would still not be able to route. Something needs to
configure the downstream prefixes from the downstream router to the
upstream router.
In other words, you need:
 - prefix delegation,
 - static configuration, or
 - a real routing protocol.

Once you have one of these, RS/RA is effectively useless.

> The same question for autoconfiguring the prefix it advertises on its
subnets.

You cannot do that statelessly. That's why.

--

-- 
Rémi Denis-Courmont
http://www.remlab.net

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