In your previous mail you wrote: I was confusing about valid lifetime. But <draft-ietf-ipv6-2461bis-04.txt> says, the value 0 is just a special case. => you should read the whole subsection 6.3.4 because it is clear the "on-link" function and "addrconf" function follow a different rule about valid lifetime (2461bis text is about "on-link" and has no DoS issue, 2462bis text is about "addrconf" and has the 2 hour rule).
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