Qiong,

> [Qiong] and a sub-mode for "source IPv6 address determiniation", how to 
> determine the encapsulated IPv6 source address.
> 1) algorithmic, LAN prefix + embedded IPv4 address/PSID in Interface 
> Identifier (MAP) 
> 2) WAN IPv6 address (DS-Lite, LW46, Public 4over6)
>  
> Right ?

MAP could also create its tunnel endpoint address from the WAN prefix (not 
address).
so you'd have, for CPE tunnel end point address:

1) arbitrary IPv6 address (DS-lite)
2) WAN IPv6 address (DS-lite, LW46, Public 4over6)
3) Algorithmic End-user IPv6 prefix + Well known interface-id (MAP)

cheers,
Ole

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