In your letter dated Mon, 2 Jan 2012 19:21:45 -0500 you wrote: >I have been told of real-world IPv6 deployments >where the link MTU is smaller than 1280, >while the limited link bandwidth makes adding a new >segmentation protocol layer impractical. I believe >these account for some of the 576 byte or 512 byte >advertised Link MTU sizes in IPv6 PMTU "Too Big" >messages that are seen in the real world.
So if you run TCP over such a link then you an get extra overhead of more than 60 octets (IPv6 header + TCP header) compared to a link with an MTU of 1280. For UDP the amount is about the same (IPv6, fragment header, UDP header). And you are saying that that sort of overhead doesn't warrant finding an unused bit somewhere to signal an adaptation layer? -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
