>> optimistic DAD looks to me to be a good compromise.
>A possible implication of optimistic DAD (i.e. where an address is assigned
>to the interface and used before it is known whether it is a duplicate) is
>that
> - neighbor caches in order nodes will have the wrong information and need
> to be switched back to the correct, original information once DAD fails.
> - TCP connections might be reset (a packet arrives at the new node, which
> doesn't have the TCP state so it sends a reset; the real "owner" of the
> address has the TCP state)
for this reason, i'm not a fan of optimistic DAD. my preference
is to run full DAD (will take 1 second or so), for every address
assigned to the node. the rule is simple - run it for every address
you assign to the node, that's all.
itojun
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