Re: Path MTU for draft-ietf-v6ops-mech-v2-00.txt

[itojun@iijlab.net]

>>>>	1280 is the only link MTU requirement value appears in RFC2460, and it
>>>>	is the minimum required value for any IPv6 links  (which does not
>>>
>>>It is true that 1280 is the minimum required value for an IPv6 link. But,
>>>the reason we use, e.g., 1500 for Ethernet instead of 1280 is that 1500
>>>provides greater efficiency w/o resulting in black holes or excessive link
>>>layer fragmentation. IPv6-in-IPv4 tunnels should strike a similar balance
>>>by setting an MTU of up to 1380 bytes.
>> 	i disagree.
>You disagree that IPv6 links should strive for greater efficiency by
>setting a larger MTU than the IPv6 minimum of 1280 bytes if possible?

	correct.  if you want efficiency, dynamic MTU case in mech-v2
	should give you the efficiency.  leave non-dynamic as is (1280).

itojun