[Bug 283450] ARP problem

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283450

            Bug ID: 283450
           Summary: ARP problem
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dym@afalina.od.ua

Upgrade from 13.4 to 14.2/
Before:
# uname -a
FreeBSD vpn 13.4-RELEASE-p2 FreeBSD 13.4-RELEASE-p2 3f40d5821 VPN amd64
After:
# uname -a
FreeBSD vpn 14.2-RELEASE FreeBSD 14.2-RELEASE c8918d6c7 VPN amd64

There was a problem with the mpd5 VPN server: VPN clients can connect and
access the VPN server, but cannot access the internal network behind that
server.

tcpdump shows that only arp requests appear on the VPN server.

If I add directive route /32 to the client on the internal machine, access to
the specific internal machine appears.

When connecting the client, an error appears in mpd.log:
mpd5 system: command "/usr/sbin/arp" returned 256

And from other links I see that it's not mpd5 that's the problem.
The following line in the mpd5 config does not work:
set iface enable proxy-arp

Fresh install FreeBSD 14.2 and fresh install mpd5 lead to the same result.

I found this thread:
https://forums.freebsd.org/threads/mpd5-vpn-server-clients-cannot-access-servers-lan-usr-sbin-arp-returned-256.94795/
It's certainly an option, but it's a stubby.

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