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ietf-wg-snac / draft-ietf-snac-simple

Automatically Connecting Stub Networks to Unmanaged Infrastructure
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Add restriction that usable prefix must be /64; reference RFC 7084 section 4.3 requirement L-2. #30

Closed Abhayakara closed 7 months ago

Abhayakara commented 1 year ago

This is based on Alan Collins' review of the document here:

https://mailarchive.ietf.org/arch/msg/snac/0wzbsMx_1uHFHEdw-cftEufoi-k

EskoDijk commented 1 year ago

RFC 7084 is Informational only; so that alone may not make the reason for the requirement fully clear. In RFC 4862 (Standards track) Section 5.5.3 the reason becomes clear:

  If the sum of the prefix length and interface identifier length
  does not equal 128 bits, the Prefix Information option MUST be
  ignored.

So that shows why any PIO other than /64 on the Wi-Fi or Ethernet link is not usable: because a host won't use it for SLAAC.