[Bug 254675] ICMP Unreach needfrag is broken in 13.0-RC4

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254675

--- Comment #1 from Aleksandr Fedorov <afedorov at FreeBSD.org> ---
This is very funny:

root at GW_13RC4:~ # tcpdump -i lo0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lo0, link-type NULL (BSD loopback), capture size 262144 bytes
15:32:30.655851 IP localhost > <GW_13RC4 public IP>: ICMP <remote public host>
unreachable - need to frag (mtu 1500), length 576
15:32:30.693492 IP localhost > <GW_13RC4 public IP>: ICMP <remote public host>
unreachable - need to frag (mtu 1500), length 576
15:32:30.713231 IP localhost > <GW_13RC4 public IP>: ICMP <remote public host>
unreachable - need to frag (mtu 1500), length 576

So, ICMP packets were sent, but from localhost to localhost.

It seems that the 12.2-RELEASE checks the packet size before NAT, but the
13-RC4 after.

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