Hi Dave and Rahul, Thanks for your valuable comments on the IID construction in 6lo-WBAN. Since I am one of the co-authors, it is my pleasure to provide more information of the current IID construction in this draft:
There are two kinds of nodes in a WBAN, namely BAN coordinator and BAN nodes (not sure whether I name them correctly). Each BAN coordinator holds an 8-bit BAN ID. BAN nodes need to associate with the BAN coordinator using MAC48 address, then the BAN coordinator allocates an 8-bit short address to each BAN node. When multiple BAN coordinators exist in a subnet, each BAN coordinator holds an unique BAN ID after negotiations. So, the BAN ID and the 8-bit node address are not built-in constant addresses in a WBAN device, and the current IID construction method in the draft guarantees its uniqueness inside a subnet. Regards, Jianqiang Hou (Derek) draft-sajjad-6lo-wban-01 https://datatracker.ietf.org/doc/draft-sajjad-6lo-wban/
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