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


itojun@iijlab.net wrote:

	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?


what is the reasoning behind "1380"?

See: 'draft-ietf-ngtrans-isatap-13.txt', section 6.1.

Fred
ftemplin@iprg.nokia.com