>>If there is enough of the packet included to translate the ICMP
>>then it is better to both adjust the path MTU and do the translation.
>>If you only adjust the path MTU it will take another packet drop
>>(with an ICMPv6 packet too big from the tunnel entrypoint) before the
>>IPv6 sender sees the path MTU. If you do both (when the ICMPv4 packet
>>included sufficient headers) then a single packet drop is sufficient
>>to notify the IPv6 sender of the path MTU.
> I guess we are talking about the same behavior with different wording.
oops, you right.
"translation" - send ICMPv6 as soon as B gets ICMPv4
normal behavior - learn PMTU, and then send ICMPv6 on next bigger packet
if you don't turn on DF bit on outer IPv4 header, you can avoid this
whole translation thing for too big messages, btw.
itojun
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