>> The problem with RFC4821 (assumming the ICMP-free variant) is
>> that it has a longer convergnece time that ICMP-enabled PMTU.
>
> RFC4821 works even if there are no ICMPs, but will
> converge more quickly if there are ICMPs. That is why
> RFC4821 should be a SHOULD for hosts, and generation
> of ICMPs should be a MUST for routers.

Does not this also imply that ICMP-generating routers MUST use a
globally unique IPv6 address as the source of the ICMP?

Regards,

- HÃ¥vard
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