Automatic LAN Subnet Reassignment

Fernando Frediani fhfrediani at
Mon Feb 21 14:26:31 PST 2022

Interesting feature.
Another similar thing is when someone connects a OpenWrt WAN port to 
another router LAN port (cascading) which has IPv6 support as the 
upstream router isn't normally able to do Prefix Delegation with its LAN 
prefix the OpenWrt router detects it and re-configure itself with NDP 
Proxy to use the same/64 in the WAN for the LAN therefore not loosing 
the IPv6 connectivity.

People often connect routers in this way by mistake instead in a AP mode 
and breaks IPv6 connectivity so a solution like this would preserve IPv6 
connectivity all the way.


On 21/02/2022 18:38, Rich Brown wrote:
> There is a new RFC on the OpenWrt forum proposing "Automatic LAN Subnet Reassignment" The RFC responds to the advice given at last week's OpenWrt-Adm meeting (
> The intent of the proposal is for the default configuration to assign a LAN subnet that avoids a conflict with the WAN subnet, and provide a mDNS name such at OpenWrt.lan for connections.
> I have two requests:
> 1) Please make comments on the technical merits of the proposal on the OpenWrt forum at the link above.
> 2) If the proposal seems to make sense, please consider the process by which we would incorporate this into the main release (likely, not for 22.0x, but perhaps the next release?)
> Thank you.
> Rich
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