RFC1883 and ipv6 spec v2

[A.N.Kuznetsov]

hello!

> I would like to see this nailed down and committed to.

Golden words! End-to-end flow label interpretation should be
declared "MUST" in RFCs. Look at Cisco tag switching!
They DO already assume, that they are allowed to mangle flow labels.
Maybe, it should be stressed specially that if someone wants
to override flow label while a packet passes through a cloud
with special policy he MUST restore original value upon exiting
from cloud or delivering packet to end host.

Otherwise, all the concept will be useless.

Alexey Kuznetsov