Re: Default address used

On Thu, 2005-11-24 at 13:55 -0500, Roy Smith wrote: 
> On Thu, 24 Nov 2005, Fredrik Tolf wrote:
> > The point is that the link-local address can only (as the name implies)
> > be used on the local link. Routers are forbidden to route it beyond the
> > same physical link network.
> 
> I'm not sure what you mean by "route it beyond the same physical link
> network".  How does that differ from "route it at all"?

Well, locally generated packets are also "routed" onto a local link.
While that may not be "routing" in the term's strictest sense, it still
is a kind of routing, since it goes through the exact same algorithms.

It would also be valid behavior, although probably worthless, to create
an IPv6 packet with a routing header, send it to a local router, and
make that router route it on to another node on the same link. 

Therefore, packets with link-local addresses can be routed, but they may
not leave the link that they originated from. The distinction is tiny,
but it exists.

Fredrik Tolf


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