working group, [changed subject]
in the context of http://tools.ietf.org/html/draft-gont-6man-predictable-fragment-id-02 any opinion on how to proceed? - document covering predictable values in IETF protocols in general - document predictable IP ID fields in both IPv4 and IPv6 - fix the predictable fragment ID problem in IPv6 - do nothing? cheers, Ole On Apr 26, 2012, at 22:53 , Fernando Gont wrote: > Hi, Ole, > > On 04/26/2012 08:50 AM, Ole Trøan wrote: >>> I think that draft-gont-6man-predictable-fragment-id is also ready >>> for wg call for adoption as wg document -- I've rev'ed the >>> document since IETF 83 in response to the feedback received during >>> my presentation (i.e., just require the Frag ID to be >>> unpredictable, without mandating any particular algorithm). >> >> the chairs have an action item on taking this to the mailing list. >> there was an issue that I believe Bob raised, if we were going to >> have publish RFCs on every field in TCP/IP protocols that should >> have unpredictable values, or if we should have a generic >> recommendation applying to protocol design in general. > > I believe that a generic document about protocol design that discusses > this issue would be valuable, such that *new* protocols and protocol > implementations do not incur into this problem. However, in this > particular case (Fragment ID), the IPv6 standard itself is suggesting > to use a counter, and hence the spec should be fixed. > > That aside, different fields have different requirements. For example, > the constraints for randomizing the transport protocol ports are > different from those of producing unpredictable IDs, and different from > those of say, randomizing the TCP sequence numbers, or randomizing the > IPv6 Flow Label. The consequences of the particular approach that you > follow vary quite a bit in each case. > > Thanks, > -- > Fernando Gont > SI6 Networks > e-mail: fg...@si6networks.com > PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 > > > -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
