Message before was missing the most essential line (cut+paste error),
correction as below.
And I think I have found why some of my systems are not concerned
by the bug: apparently the problem appears only with packets that
are locally created.
Packets that are traversed (with net.inet.ip.forward
I did now a testcase, as follows:
===
root@zwlf:~ # cat /boot/loader.conf
net.fibs="3"
net.inet.ip.fw.default_to_accept=1
root@zwlf:~ # uname -a
FreeBSD zwlf 12.3-RELEASE FreeBSD 12.3-RELEASE r371126 GENERIC amd64
root@zwlf:~ # k
