Problem with IPv6 traffic since update 26.1.6

[odites999]

After trying many things due to the TLS handshake error I mentioned in another post, the only way I could get Opnsense working normally was by disabling IPv6.

I replicated the same configuration (VLANs, PPPoE, IPv6 over PPPoE) on another virtual machine on the same host but with OpenWrt, and everything works fine: IPv4 and IPv6 traffic, and test-ipv6.com (it recognizes my provider correctly and passes the test with a perfect score of 10/10). Therefore, I understand that something caused IPv6 to stop working with my configuration during the upgrade from version 26.1.5 to version 26.1.6. Is there a way to revert to a previous version by downgrading the version packages if necessary to try and pinpoint the problem?

Thanks in advance.

[nero355]

Is there a way to revert to a previous version by downgrading the version packages if necessary to try and pinpoint the problem?

Ehh... is this what you need : https://docs.opnsense.org/manual/opnsense_tools.html ??

[odites999]

Thanks @nero355. I will try that and see the results.

[odites999]

I've downgraded to version 26.1.3 (it was working fine until 26.1.6). I don't know if the ISP changed something coinciding with the update to 26.1.6_2, but since then, IPv6 simply won't work. I can ping from the firewall just fine, but traceroute sometimes works and other times times out, and clients on the network can't access anything using IPv6... youtube.com, for example. I've tried changing various PPPoE connection parameters, but nothing works.

[riverchu2023]

Hi, I think I'm running into the same issue after upgrading to 26.1.7_1.

My setup uses a Loopback interface to bind the delegated IPv6 prefix from WAN, and my LAN interfaces use ULA addresses. I also have NPTv6 configured to translate the prefix on the WAN side.

After the upgrade, I noticed that some devices, mainly iPhones and Chromecast, are having trouble with IPv6 connectivity. Windows devices seem to be working fine. I also noticed outbound traffic showing up on the Loopback interface, which I had not seen before the upgrade.

After downgrading the kernel to 26.1.6, IPv6 connectivity returned to normal, and the Loopback interface no longer shows traffic.

[odites999]

I just noticed that the "overview" section now shows routes that I swear weren't there before the problem started (images attached). I also tried it from a Windows client (my usual one is Linux) and it has the same problem (including the slow TLS handshake), but on Windows it continues to load pages after 3-4 seconds, while on Linux it takes so long that browsing is impossible.