Hi
I have a strange issue with my DEC 740 running OPNsense. Since 2 days and after a failure at my ISP, I have lost IPv6 connectivity. I'm running OPNsense 25.7.2.
My ISP supplies an IPv6 and a /64 IPv6. I can see on the WAN side that it gets well the /64 from ISP but nothing at all on LAN side. It doesn't even distribute a local fe... IPv6 address. What should I check to find out why it doesn't work anymore without reason ?
Thanks
Vincèn
Hi
Additional info if someone has an idea: my ISP confirmed my router is well working for IPv6 on WAN side so not sure what's wrong on LAN side or if it's due at recent upgrades that have quite modified applications used for DHCP as far as I undersand !
Thanks
Try to follow this troubleshooting guide and let me know: https://docs.opnsense.org/manual/ipv6.html#basic-setup-and-troubleshooting
Cheers,
Franco
Quote from: franco on September 10, 2025, 02:43:25 PMTry to follow this troubleshooting guide and let me know: https://docs.opnsense.org/manual/ipv6.html#basic-setup-and-troubleshooting
Hi Franco
Thanks for the link and I already tried to follow that quide but it's too general and was not helpful at all. All the more my ISP tells me I have to use DHCPv6 with PD but option doesn't exist on WAN port in my OPNsense :(
Vincèn
Hi Vincèn,
The fundamental question from the guide is simple: does your WAN get IPv6 from the ISP? And if, yes, do your clients get IPv6 from your OPNsense?
Without the answer to this question we don't know which end has to be debugged. I'm leaning towards the WAN side but I have literally no way to know this from the information you already provided.
Cheers,
Franco