Opened 10 years ago

Closed 10 years ago

#212 closed editorial (fixed)

Option numbers 14, 28, 42, ... reserved but usable

Reported by: cabo@… Owned by: draft-ietf-core-coap@…
Priority: minor Milestone: post-WGLC-1
Component: coap Version: coap-09
Severity: In WG Last Call Keywords:


Section 5.4.5. (Option Numbers) states that "the numbers 14, 28, 42, ... are reserved for 'fenceposting'". It is actually not necessary to reserve them for this; options with those numbers just need to have a default value that is encoded with zero bytes. The Vendor option in -misc already takes advantage of this.


Clarify that while the positive option numbers divisible by 14 are indeed reserved, they still are available for allocation as long as a zero-length option with each of these numbers remains available as a no-operation option for fenceposting.

(msg03034a, also covers msg03072cc)

Change History (2)

comment:1 Changed 10 years ago by zach@…

Done in r687.

comment:2 Changed 10 years ago by zach@…

  • Resolution set to fixed
  • Status changed from new to closed
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