Subject: [core] Updates in core-groupcomm-19

From: "Dijk, Esko" <[email-masked]>
Date: Mon, 30 Jun 2014 06:07:54 +0000

Dear all,

the recent update of core-groupcomm includes the following updates:

o  Added guideline on Token value re-use in section 2.5<http://tools.ietf.org/html/draft-ietf-core-groupcomm-19#section-2.5>.

o  Updated section 5.1<http://tools.ietf.org/html/draft-ietf-core-groupcomm-19#section-5.1> (Security Configuration) and 5.3.3 (Future
      Security Evolution) to point to latest security developments
      happening in DICE WG for support of group security.

o  Added Pervasive Monitoring considerations in section 5.4<http://tools.ietf.org/html/draft-ietf-core-groupcomm-19#section-5.4>.

The Token value re-use guideline is an addition based on the discussion thread "Handling tokens for No-response", where this issue was identified.
For multicast the Token re-use time is now advised to be at least:
  NON_LIFETIME + MAX_LATENCY + MAX_SERVER_RESPONSE_DELAY
which is in the order of several minutes. Note that there is no limit on MAX_SERVER_RESPONSE_DELAY in the CoAP protocol, just like in the HTTP case.

Esko & Akbar

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