Le 21 avr. 2010 à 23:17, Brian E Carpenter a écrit : > On 2010-04-21 20:50, Rémi Després wrote: >> Hi Brian, >> >> I wonder what you think of what I answered to James on another discussion >> thread. > > I agree. I think that particular SHOULD in the RFC is an error. It "SHOULD" > have said something like: > > "The source node MUST select new Flow Label values by a method that > prevents unintended Flow Label value reuse."
Yes, that's more appropriate. Suggesting in addition that a 5-tuple hash can be an easy way to set flow-label values, because it is stateless, would IMHO improve chances that host really set them. Wold you agree on this too? RD > > Brian > >> Regards, >> RD >> >> >> Début du message réexpédié : >> >>> De : Rémi Després <[email protected]> >>> Date : 21 avril 2010 10:43:55 HAEC >>> À : james woodyatt <[email protected]> >>> Cc : 6man 6man <[email protected]> >>> Objet : Rép : Draft-krishnan-ipv6-exthdr-08 to become asap a 6man WG draft ? >>> >>> ... >>>> In general, only some IPv6 packets have 5-tuples, and of those, only a >>>> subset can have 5-tuples that packet analyzers can extract, i.e. the rest >>>> are encapsulated in ESP or a moral equivalent (and ESP packets have >>>> 4-tuples). >>>> >>>> Hosts should set flow labels. >>> Agreed. >>> >>> This should be IMHO the conclusion of the current discussion on flow >>> labels, BUT provided hosts are explicitly permitted to set flow-label >>> values statelessly for each datagram, with a hash of their 5-tuples. >>> (RFC 3697 says "To avoid accidental Flow Label value reuse, the source node >>> SHOULD select new Flow Label values in a well-defined sequence", which >>> privileges flow-label assignments that are stateful per connection, a >>> choice significantly more complex than needed.) >>> >> >> > -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
