https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216719

[email protected] changed:

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--- Comment #2 from [email protected] ---
(In reply to bsd from comment #1)

You have set net.link.ether.ipfw=1b

Are you using any rules for layer2 ?  If not, set that to 0.  If so,
likely best to follow the example in ipfw(8) /PACKET FLOW to separate
layer2 from layer 3 processing, otherwise every rule is tested on
both layer2 and layer 3 passes, i.e. usually on each of 4 passes.

Which is why adding 'not layer2'  to the nat rule fixed it here, but
other dragons may lie hidden in other rules checked at both layers.

But of course, it shouldn't panic .. backtrace looks all layer2.

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