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i have the same problem with 23.1.7_3.
i advice to go back to 23.1.6 most of people has tested this

Thanks for the tip. I actually just disabled IPv6 (as it's not critical for me for the moment - and have to get some work done) and everything is now working as a charm. DNS resolution back down to ~1ms for locally cached results (and 4ms for results fetched from Cloudflares cache).

I applied the patch mentioned in https://forum.opnsense.org/index.php?topic=34241.msg165713#msg165713 and it fixed some issues, but no the DNS lookup issue.

DNS resolution has also become very unstable for me after upgrading to 23.1.8. Using Unbound and Cloudflare as upstream DNS.

I've been running dual stack IPv4/IPv6 on my current ISP with no issues for more than half a year, and nothing seams to have changed on their side.

Looking at Smokeping, resolving test.test on unbound from my local network, I see a huge difference after upgrading to 23.1.8. Spikes going over 800ms and even some timeouts. Internal latency is <0.7 ms.

DNS resolution from my wired laptop are now fairly consistent > 40ms (even for cached results) and before the upgrade they were < 1ms for cached results.

I used to have 20/20 on ipv6-test.com, but now various tests time-out (inconsistent between refreshes) so I end up somewhere between 10/20 and 18/20.

I'll try to downgrade to 23.1.7_3 to see if it helps.