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#11

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by Boxer - February 10, 2026, 10:30:34 PM

I would roll back to 25.7.11_9, delete your wan mtu and leave it blank, reboot. Then update to 26.1 and re-enter your wan mtu 1508. Maybe there's some shenanigans during the update

#12

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by Taunt9930 - February 10, 2026, 10:28:03 PM

This does not look like an MTU issue if you can use those ping sizes - it look just fine.

Did you also use traffic shaping? Maybe the old ISP had lower speeds and you shape it to fit? Happened before...

Just saw that you disabled all shaping...

No idea what could be wrong.

It's a weird one, isn't it!?

When I've got more time I'll try a 3rd update from the working 25.7 snapshot.

#13

Hardware and Performance / Re: DEC750: can I mix 2.5/5Gbp...

Last post by axiom - February 10, 2026, 10:21:55 PM

Sorry for bringing up an old thread.
@meyergru could you elucidate about how it works. I have exactly the same setup, except it doesn't work -
DEC740 with DAC SFP+ (auto selected to be 10GBase-SFI) at ax0 as LAN
I have a Luleey GPON stick (manually selected to be 1000Base-SGMII) at ax1.
However, the ax1 shows no-carrier and red. What do I need to do to bring up the Luleey GPON stuck at ax1?

If the Luleey isn't compatible with the DEC700, is there a stick with Realtek RTL9601D that may work?

Oh, I forgot: You definitely can mix SFP+ 10 Gbps and SFP 1 Gbps in both slots on the DEC7x0: I actually use this with one DAC SFP+ (10GBase-SFI) for LAN and one GPON stick at 1Gbps (technically 1000Base-SGMII) for WAN.

The latter one could even support 2.5 Gbps, but as I said, I never got it running, probably because of the 10 Gbps DAC in the other slot.

#14

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by meyergru - February 10, 2026, 10:13:08 PM

This does not look like an MTU issue if you can use those ping sizes - it look just fine.

Did you also use traffic shaping? Maybe the old ISP had lower speeds and you shape it to fit? Happened before...

Just saw that you disabled all shaping...

No idea what could be wrong.

#15

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by Taunt9930 - February 10, 2026, 10:10:23 PM

I'm on BT PPPOE (Openreach) and just set the wan mtu to 1508 without any issues on websites. Are you on Zen Openreach or Zen City Fibre?

Openreach. As said, been running that config with no issues since around 23.7.5 and as per Meyergru (with physical interface explicitly stated) before that.

Upgrade to 26.1 breaks something. I've done it twice now, same result.

#16

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by Boxer - February 10, 2026, 10:00:16 PM

I'm on BT PPPOE (Openreach) and just set the wan mtu to 1508 without any issues on websites. Are you on Zen Openreach or Zen City Fibre?

#17

General Discussion / Re: OPNsense 26.1.1 with Adgua...

Last post by nero355 - February 10, 2026, 09:46:23 PM

Not to be argumentative but I have been using 5353 for a long time without ill effects. Some 'tutorials' also use it.

But I can see your point.

Just wanted to warn you, because the guys @ https://docs.pi-hole.net/guides/dns/unbound/ made that mistake many years ago and switched from 5353 to 5335 and my guess is OPNsense now uses by default 53053 because of the same reason :)

I have no idea why a port forward is in the mix. I don't use it and never have on either OPNsense or pfSense.  As I said , not problems, ever.

You don't use any Redirect DNS NAT rules then I am guessing ?

I like having them to catch "Naughty Clients" on my network just in case... :)

To repeat, sometimes there is only one way to do something, but with BSD software there are often lots of ways.

Actually if you talk about pure FreeBSD then the explanations written in the FreeBSD Handbook is pretty much the way to do it IMHO : https://docs.freebsd.org/en/books/handbook/
It has taught me a lot of things about 20+ years ago...



Hmm... I am getting old... LOL! ^_^

#18

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by Boxer - February 10, 2026, 09:40:45 PM

I don't know for sure because I only switched to DNSmasq RA after 26.1. I've since switched back to radvd which fixed all my problems

#19

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by Taunt9930 - February 10, 2026, 09:38:06 PM

Are you using DNSmasq Router Advertisements or RADVD? I was seeing some peculiarities on some websites unless I explicity set the RA MTU in DNSmasq. Switch to RADVD (if you're using DNSmasq RA) and see if your issues persist

I'm using RADVD. I am sure I tried explicitly setting the MTU there also. Did something change between 25.7.11_9 and 26.1 in the Router Advertisements - was the issue you saw only after 26.1 upgrade?

Issues are across IPv4 and IPv6 - they persist if I disable IPv6 on my client machine.

#20

26.1 Series / Re: 26.1.1 MTU Issues on PPPoE

Last post by Boxer - February 10, 2026, 09:33:10 PM

Are you using DNSmasq Router Advertisements or RADVD? I was seeing some peculiarities on some websites unless I explicity set the RA MTU in DNSmasq. Switch to RADVD (if you're using DNSmasq RA) and see if your issues persist