In message <20160120001031.9209.94235.idtrac...@ietfa.amsl.com>, "Alissa Cooper " writes: > Alissa Cooper has entered the following ballot position for > draft-ietf-dnsop-cookies-09: Yes > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-dnsop-cookies/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > (1) > "To avoid > rollover synchronization and predictability, it is RECOMMENDED that > pseudorandom jitter in the range of plus zero to minus at least 40% > be applied to the time until a scheduled rollover of a DNS cookie > secret." > > Why is it recommended to only vary the interval in only the shorter > direction (I'm assuming that is what is meant by "plus zero")? Then the > interval will only ever get shorter, it seems.
No. There is the desired lifetime and the scheduled rollover. The scheduled rollover is computed from the desired lifetime not the previous scheduled rollover. This could be done once creating a interval timer unique to this client or whenever the timer fires. > (2) > It seems like there should be a recommendation about when to delete an > old client cookie (e.g., after receiving a response to an outstanding > request, or after some period of time with no response). Why? There is no recommended time for when to abandon a DNS request without a cookie. A old cookie is only useful for as long as the client is expecting a reply which should be self evident. You match the sent client cookie with that in the reply not some arbitary client cookie. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
