Hi, I created a ticket for the short MAC address collision issue. Yes, we do recognize that this is something to fix, and are happy to integrate a solution. Of course we want to minimize the technical changes to the draft as much as possible, and be sure that the solution doesn't have bad side-effects.
Samita posted a good problem statement to the list, which I captured in this ticket. I threw in a couple known solutions to the ticket as well, one that was thrown already already before/during Maastricht, and another posted to the list by Colin. Surely there may be more as well. Zach On Aug 27, 2010, at 4:23 PM, 6lowpan issue tracker wrote: > #126: Short MAC address collision > --------------------------------+------------------------------------------- > Reporter: z...@… | Owner: sami...@… > Type: defect | Status: new > Priority: major | Milestone: > Component: nd | Version: > Severity: - | Keywords: > --------------------------------+------------------------------------------- > An EUI-64 node may want to use non-EUI-64 based IPv6 address for > communication or it may want to register multiple addresses at the same > time via multihop DAD mechanism. We need a way to verify that the > additional IPv6-address and its corresponding link-layer address(non- > EUI-64) are unique in a 6lowpan network. [ via multi-hop DAD mechanism]. > However, for the address registration NS message, the node should use an > EUI-64 based IPv6-address and corresponding MAC address to avoid any > collision in the local link due to duplicate MAC-addresses. > > There are a couple different ways to allow an LL64 to be used during > registration of a tentative (possibly non-unique) address. > > 1. Carry the address to be registered in the ARO for the initial > registration of a tentative address. Use the address to be registered as > the IP SRC address after that as in ND-12. No changes required to the > multi-hop DAD mechanism. > > 2. Carry the address to be registered and the LLA always in the ARO, see > proposal by Colin on the list. > > -- > Ticket URL: <http://trac.tools.ietf.org/wg/6lowpan/trac/ticket/126> > 6lowpan <http://tools.ietf.org/6lowpan/> > -- Zach Shelby, Chief Nerd, Sensinode Ltd. http://zachshelby.org - My blog "On the Internet of Things" http://6lowpan.net - My book "6LoWPAN: The Wireless Embedded Internet" Mobile: +358 40 7796297
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