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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.

That sounds exactly what was happening to me, however I don't see any new routes on my end.

Edit: This is quite weird, I reverted back to 26.1.7 kernel and IPv6 still works. I haven't changed anything besides downgrading/reverting the kernel. I don't see traffic on the Loopback as well (expected behavior).

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.

Hi,

Can you try this patch?

https://github.com/opnsense/core/commit/287c13beb

# opnsense-patch 287c13beb


Cheers,
Franco

This worked for me.