#65: Deriving IIDs from Short Addresses
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Reporter: j...@… | Owner: j...@…
Type: defect | Status: new
Priority: major | Milestone:
Component: hc | Version:
Severity: Active WG Document | Keywords:
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One of the issues raised on the ML and in Anaheim is the issue of deriving
IIDs from IEEE 802.15.4 short addresses. There was general consensus that
the PAN ID should never be included in the IID. As such, I think we now
have the following two options:
1) Maintain the RFC 4944 translation (short address -> ethernet address ->
64-bit IID). Generated IIDs will be 64 bits in length and of the form
(0000:00ff:fe00:xxxx), where xxxx is the short address.
2) Update RFC 4944 translation to (short address -> 17-bit IID).
Generated IIDs will be 17 bits in length and of the form
(0000:0000:0001:xxxx), where xxxx is the short address.
The primary difference between the two options are the lengths of prefixes
that may be used to generate global addresses. Option 1 says that
different PANs must be assigned unique 64-bit prefixes. Option 2 says
that different PANs must be assigned unique 111-bit prefixes, but that
multiple PANs may utilize the same 64-bit prefix.
I am comfortable with either option, but we need to agree on one that is
well-defined. So which would people prefer? If you have no preference,
please provide that feedback as well.
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Ticket URL: <http://trac.tools.ietf.org/wg/6lowpan/trac/ticket/65>
6lowpan <http://tools.ietf.org/6lowpan/>
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