[OpenWrt-Devel] Questions about IPv6 and NDP-Proxy

[Fernando Frediani]

Hello

I have seen on some old OpenWrt documentation 
(https://openwrt.org/docs/guide-user/network/ipv6/start#router_advertisement_dhcpv6) 
that by default when the router cannot receive a IPv6 Prefix Delegation 
(IPv6-PD) but only an IPv6 in the WAN it can automatically detect it and 
act as a NDP-Proxy so the clients in the LAN interface have IPv6 
connectivity.

I have tested it and was unable to observe this behavior without 
changing any configurations. If however I configured both the LAN and 
WAN6 interfaces as DHCPv6, RA and NDP in Relay mode plus WAN6 with 
'option master 1' then it works as expected.

Does anyone know if this automated behavior is expected or if in these 
cases it is always necessary to configured the interfaces in such way to 
make that work ?

This is useful as many people inadvertently connects the LAN port of a 
home router to a WAN port of a second router in order to extend signal 
and by using this technique allows that users connected to the secondary 
routers to keep IPv6 connectivity.

Thanks
Fernando


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