Kacheong Poon writes:
> But this is only half the question.  Can a machine with only
> routable address talk to a machine with only LLA if they happen
> to be on the same link?  How can this happen?  Maybe because of
> a mis-configuration?

Yes, or a failing DHCP server, or a server that refuses to provide
addresses to certain kinds of clients.

I suspect that talking to such machines on your local network (when
you have a routable address yourself) requires special work.
Otherwise, you'll misidentify the peer as off-link and send your
replies to a router.  (Perhaps it'll still work if there's a matching
route and the router knows what to do with LLA ... and allows
one-armed forwarding.  More likely, it'll fail.)

Thus, doing nothing means that windows/mac machines stuck with LLAs
(for whatever reason) will be accessible only by 'cheating.'  The user
will have to explicitly (manually) configure an address in the LLA
range on one of the interfaces, and treat it as a regular subnet.
That might be "good enough" for most debugging purposes.

-- 
James Carlson, Solaris Networking              <[EMAIL PROTECTED]>
Sun Microsystems / 1 Network Drive         71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677
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