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I tested this on all the Deciso appliance variants running the E810 with 10G-SR and 25G-SR fiber optics. All link and communicate just fine with the DDP package loaded. The link may take a few cycles to come up, but this shouldn't be a problem.

Reading all of the reports in here, as well as https://forum.opnsense.org/index.php?topic=52405 I'm seeing quite some variablity in reported firmware version and indeed https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296989 also reports versions >= 4.60. The only report in the forum post concerning a DEC4280 was on a non-standard firmware version (DEC devices run NVM 4.30), which is not something that's supported.

Maybe this is something worth mentioning in documentation (E810 NVM firmware versions that are officially supported / verified).

Hello,
thanks to everyone who shared their experience in this thread.

We are currently running OPNsense 26.4.1 which is based on FreeBSD 14 and will stay on that version until the issue described in this thread got fixed.

We are using Intel E810-CQDA2 NIC, NVM version 4.80 which seems to work fine under FreeBSD 14. No issues whatsoever.

The issue described in this thread sounds like a regression in FreeBSD 15.

I think it would be great if we had the option to use the official driver from Intel instead of the one integrated in FreeBSD kernel tree.
Maybe that would solve the issue described here.

If OPNSense Team would decide to build and package the driver from intel and offer it as an optional package, it would be greatly appreciated.

Best regards