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same config (dual stack, IPv6 via PPPoE) gives me lower MTUs:

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Direction Tested Maximum Size Segment Client Sent MSS Notes
Server to Client IPv4 1452 1452 OK
Client to Server IPv4 unlimited (n/a) OK
Server to Client IPv6 1432 1432 OK
Client to Server IPv6 unlimited (n/a) OK


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got in probe for mss 536 (max seg 1452)
got in probe for mss 1452 (max seg 1452)
got in probe for mss 1452 (max seg 1452)
finished in probing, maximum mss 1452 peer mss 1452 initial peer mss 1452
got out probe for mss 343
got out probe for mss 1453
got out probe for mss 9000
finished out probing, maximum mss 9000
got in probe for mss 536 (max seg 1432)
got in probe for mss 1432 (max seg 1432)
got in probe for mss 1432 (max seg 1432)
finished in probing, maximum mss 1432 peer mss 1432 initial peer mss 1432
got out probe for mss 343
got out probe for mss 1433
got out probe for mss 9000
finished out probing, maximum mss 9000
PINGs seem to transmit the "full" MTU 1500, though (both from a client and from OPNsense):

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ping -4 -c4 -D -s 1472 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 1472(1500) bytes of data.
[1770722028.061190] 1480 bytes from 1.1.1.1: icmp_seq=1 ttl=58 time=5.63 ms
[1770722029.062243] 1480 bytes from 1.1.1.1: icmp_seq=2 ttl=58 time=4.75 ms
^C

I'd really like to get it working again. Any suggestions where I should look?

My AGH -> Unbound setup runs fine (and has run fine) for several years, so it is something in your setup.

As one data point: Do not use port 5353.  That port is used for mDNS.  Most of the guides get this wrong because 5353 is just so convenient and easy to remember ...

That probably does not explain your issues, though.

Thank you all for the feedback!  Does the 3rd party plugin automatically update itself?  I would like to try to stay as hands-off as possible.

Not really. The mimugmail repo is not updated often.
You can easily update Adguard Home from the "update" button of Adguard Home's web GUI.

Same here.

There is also a 3rd party plugin for Blocky - another DNS sinkhole like AGH or pihole:

https://forum.opnsense.org/index.php?topic=42631.0

Does anyone have insights into whether this new (beta) feature is working?

I am looking to use firewall rules to move my DHCPv6 traffic to a WFQ pipe and all my other IPv6 UDP traffic to a FQ_Codel pipe (which would otherwise eat the DHCPv6 traffic for some unknown reason).

I know of LibeQoS (Dave Täht's last project), but not much about how to employ it on a small non-ISP scale. Especially not in conjunction with OPNsense.

Care to elaborate?

Ergänzung / Präzisierung:

DHCPv6 darf nicht durch FQ-Codel o.ä. geshaped werden (sonst kommt es zum o.g. Problem, daher die "renew"s werden nicht versandt).

Bei mir funktioniert DHCPv6 nur, wenn folgendes _nicht_ durch FQ-Codel geshaped wird:
- ICMPv6
- UDP über IPv6 (!)

ICMPv6 habe ich auf eine separate "control plane" pipe gelegt (zusammen mit ICMPv4), entsprechend https://forum.opnsense.org/index.php?topic=46990.30.

Aber UDP über IPv6 macht weiterhin Probleme.

UDP über IPv6 muss ich gänzlich vom shaping ausnehmen, da (1) die "traffic shaping" rules keine Filterung nach DHCPv6 ermöglichen und (2) ich die pipe auch nicht mittels individueller firewall-rules zuweisen kann, da die automatischen Regeln für "allow IPv6" als "quick" ausgestaltet sind und daher von späteren, individuellen firewall-rules nicht mehr erfasst werden können.

Das ist unschön.

Hat jemand eine Idee? 
- Kann DHCPv6 als "Protokoll" zu den traffic shaping rules hinzugefügt werden, so dass ich das in die control plane schieben könnte?
- Kann ich die "allow IPv6" option von opnsense ausschalten und manuelle DHCPv6-Regeln verwenden, oder macht die Option noch mehr als die beiden "DHCPv6 automatic rules" zu setzen?
- ... ?

Unfortunately, the fix in acme.sh v3.1.1 does not fix this issue for me:

after ACME has updated the certificate, the user is again root:wheel:

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% ls -la /usr/local/share/java/unifi/data/keystore
-rw-r-----  1 root wheel 5974 May 25 21:33 /usr/local/share/java/unifi/data/keystore

I understand the new "experimental" section in the firewall rules can replace the "rules" in the shaper setting, nothing more.

I'd LOVE that, too :-)

But I wanna use Bandwith priorisation based on source / target / protocol (whatever) in place, too. So my IPTV is working WHILE steam is downloading big blobs.

You should not need this -- FQ_codel should automatically handle this (i.e., prioritising bursty IPTV and putting steam in the background).

I see this as well but it happened when upgrading from r_6 to r1 and r2 did not make it go away.

Same here.

For the default zroot pool, autotrim is on. While you could scrub, it would only be useful if you had multiple disks.

I tend to disagree: a scrub will check the checksums and therefore
show if the file system is corrupted.

It won't be able to self-heal with just one disk, but it will be able to tell you that you need to pay attention to that pool (e.g. replace the disk and restore from backup).

Traffic shaping breaks some IPv6 functionality (esp. DHCPv6 / ICMPv6).

"Real" traffic, though, is not affected I think.

See https://github.com/opnsense/core/issues/7342

So it _might_ be that the packet loss shown is real, as it is packet loss of ICMPv6 only, but your speeds are fine, as those are unaffected TCP/IP(v6) traffic.

Been running 25.1 since December. No issues encountered. Thanks for all the work on OPNsense!