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configuring a router

6bone folks,

I'd like to ask a question about how to specify a peer address in
a router configuration. In the previous discussion on ripng, I
understand p-to-p links including a tunnel may also have a
link-local address. Which address should be used in configuring a
router, global address, link-local address, or both?

I can agree that all routing update packets should have a
link-local source address, but even in that case, should we use a
link-local address to specify the peer? I know the use of
link-local address makes peer's renumbering easy, but I think
it's also true a link-local address sometimes changes, for
example, by replacing an interface card. Does someone have an