[Bug 295057] 14.4 breaks in-kernel nat

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295057

--- Comment #9 from Timo Voelker <[email protected]> ---
I was able to reproduce the bug and submitted a patch.

https://reviews.freebsd.org/D57091

The bug is related to a feature FreeBSD 14.4-RELEASE seems to include that
allows using checksum offloading over epair.

I don't know if the patch goes in and in which version. If you need a quick
fix, you can just disable checksum offloading on the outgoing interface in the
jail. In your setup, run

cetus: ifconfig epairXY -txcsum

After that, cetus no longer uses checksum offloading just like before
14.4-RELEASE.

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