>> The issue was simultaneous use of site-local addresses both
>> at the home site and at the visited site. I think the problem 
>> is that when we see a site local address in the stack and 
>> expect to do, say, a TCP connect to it, we don't know where 
>> that address came from.
>The scope id will tell you what site the address belongs to, in other
>words, which of your interfaces you can use to reach the address. Yes,
>this is a multi-sited issue, not specific to MIPv6.

        in mobile-ip case, mobile node would receive packets with site-local
        address on the same interface for both cases.

itojun
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