[Bug 249400] The last jail created using VNET has ARP problem

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249400

            Bug ID: 249400
           Summary: The last jail created using VNET has ARP problem
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: fred.ha11 at yahoo.com

Created attachment 218027
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218027&action=edit
/etc/jails.conf

12.2-BETA has a new issue with VNET that 12.1-RELEASE didn't have.

Initially when a list of jails are created all can be pinged. However, after
the default ARP timeout, the last jail attached to the bridge fails to respond.
If the ARP for the last jail is statically set (arp -s) it will again respond
to pings. The problem only effects the last jail attached to the bridge
regardless of the number of jails or which one is last.

My /etc/jails.conf is attached

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