For my home LAN I use an ASUS RT-N66U running the Asuswrt-Merlin (374.43 LTS) fork which is a nice simple and stable firmware and also updated regularly. My ISP is BT in the UK.
I have been using only IPv4 but decided to switch on IPv6, which BT supports.
The settings that work seem to be straightforward and mostly default:
Connection Type: Native Interface: PPP DHCP-PD: enable MTU: 1492 LAN Options: Auto Configuration: Stateless LAN Prefix Length: 64 Enable Router Advertisement: Enable Enable DHCPv6 Server: Disable
I also used these "Special ISP Options" (the first two are default while the third is not):
Enable IPv6 MTU advertisement: Yes Release addresses on exit: Yes Prefix delegation requires address request: Yes
The issue seems to arise with this last setting.
If I set it to Yes, then I get IPv6 working but my log fills up with these messages - about 1 a second:
dhcp6c: dhcp6c state change detected SOLICIT
Apart from the log messages, everything else seems to be working. My router doesn't get a global WAN IPv6 address but apparently BT don't provide one anyway. I think maybe that is the cause of the message: my router is requesting a WAN side global address and not getting one.
However, it seems that I do need this setting to get a prefix from BT. If I change the setting to No then the log messages stop but I also lose the IPv6 Gateway and the delegated prefix and, of course, IPv6 stops working.
I can't seem to get IPv6 working without the log filling up (and presumably wasted Solicit messages going out every second).
Any suggestions for what's going on and how to proceed?