Thanks Esko. Very useful.

Luigi

[email protected]<mailto:[email protected]>
Paris Research Center
Huawei Technologies France S.A.S.U.

From: Esko Dijk <[email protected]>
Sent: Friday, July 24, 2026 12:12 PM
To: [email protected]; [email protected]
Subject: [6lo] Thread - 6LoWPAN mesh network with unicast DHCPv6


Hi Luigi / 6lo,

here the pointer to the standard (outside IETF, but using many IETF 
functionalities) -- Thread -- that defines unicast DHCPv6.

The specification is downloadable but formally not public, as it requires 
accepting a license. There are some (license-free) public white papers on the 
website but these don't cover the topic.

Link to spec: https://threadgroup.org/Resources#specifications

Mesh-wide network configuration data optionally sets a "DHCP server anycast 
address" -> clients can use this, and it gets routed to the nearest 6LBR that 
has configured a DHCPv6 server or agent.  The addresses are not link-local, but 
'mesh-local' (i.e. a ULA confined to mesh scope).

best regards

Esko


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