>> Which ICMPv4 do you translate into ICMPv6 on Solaris? (or "would you
>> translate")
>>
>> Couple of analysis (all IMHO):
>>
>> ICMP6 too big messages are not directly converted from ICMPv4 too big,
>> either. B gets ICMPv4 too big from somewhere between B and C for
>> encapsulated packet, B would adjust tunnel MTU, and B originates
>> ICMPv6 too big toward A.
>> A -- B === C -- D
>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.
itojun
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