Debug IPv6 issues after PPPoE reconnect (LAN loses IPv6)

[norg]

Hi,

I have a VDSL Telekom uplink with a static IPv4 and IPv6 where the latter offers me a /56 IPv6 network. This works very well if I start the OPNSense or after I configure the LAN interface. So the LAN interface takes care of requesting the IPv6 network information and forwards this to the client.
Sometimes when the VDSL uplink is gone (power outage, other issues) and reconnects the VDSL uplink interface receives the IPv4 and also the IPv6 for the WAN side but it doesn't update the LAN interface which has lost the IPv6 information in the meantime.

My workaround for now is to go to the LAN interface in the WebUI, don't change anything, just click save and apply changes (although none have happened) and thus the interface is reconfigured again and IPv6 works again.

So there seems to be an issue with the LAN interface noticing the WAN interface gone and back online. Can you give me any hints how I could further debug this, increase log messages or which parts are involved?
If anyone know a solution even better
But I guess I need to dig into this deeper to provide you with necessary details to properly fix this issue.
So it would be helpful for me to know which parts/scripts/services are involved so I can try if I can fix it myself.

Thanks

[Lumpy]

At least I can confirm this behavior, even if I don't have a solution. My workaround for now is IPv6 via Tunnelbroker from Hurricane Electric. This works just fine. I can recommend this if you are in desperate need for an IPv6 connection.

[norg]

Well it doesn't happen all the time, maybe once a month and I can fix it. But I host some services behind the OPNSense and the DNS has the AAAA records as well so it's an issue for the time between issue occurs and I fix it manually.
Also the static IPs I have I pay for so would like to have a working solution and keen to work on that myself