* George Michaelson > One thing I *strongly* agree with: the sentence at 2.2: > > The effective MTU for IPv6 is 1280 bytes. > > This is looking compellingly awful, but true to me.
I believe this is a gross exaggeration. I'm running 1500 bytes MTU on all the clients and servers in my network, and have yet to hear about significant trouble (there have been a few, but no more than what I get with IPv4 as well). So to see if this was only me, I tried to do a simple" wget -6" of all the URLs listed in the top 100 sites sorted by Alexa rank at http://www.worldipv6launch.org/participants/?q=1 and looked at what TCP MSS values I got back: TCP MSS Count --------------- 1212 2 1220 6 1380 6 1410 3 1416 1 1420 1 1436 1 1440 67 1460 1 Total 88 Only 9% were operating on the premise that «the effective MTU for IPv6 is [<=] 1280 bytes», while a clear majority of 77% were operating with an MTU of [>=] 1500. (I did not get exactly 100 successful TCP handshakes because some URLs were down, some did not have an IPv6 address published in DNS, while on the other hand some were giving me HTTP redirects, which results in multiple handshakes.) Tore -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
