[Bug 222240] multiple ICMP echo requests reported when ping broadcast

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222240

            Bug ID: 222240
           Summary: multiple ICMP echo requests reported when ping
                    broadcast
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: hannes at mehnert.org

When I send a broadcast ping, and run tcpdump on the same host, I see multiple
ICMP echo requests in tcpdump (with slightly different timestamps).  Running a
tcpdump on a different host in the same broadcast domain only sees one ICMP
echo request!.

# ping 192.168.0.255
PING 192.168.0.255 (192.168.0.255): 56 data bytes
...

# tcpdump -lni wlan0 icmp
21:45:41.833915 IP 192.168.0.6 > 192.168.0.255: ICMP echo request, id 22192,
seq 0, length 64
21:45:41.833927 IP 192.168.0.6 > 192.168.0.255: ICMP echo request, id 22192,
seq 0, length 64
21:45:42.896747 IP 192.168.0.6 > 192.168.0.255: ICMP echo request, id 22192,
seq 1, length 64
21:45:42.896758 IP 192.168.0.6 > 192.168.0.255: ICMP echo request, id 22192,
seq 1, length 64


I reported this earlier on transport@
(https://lists.freebsd.org/pipermail/freebsd-transport/2016-September/000145.html)
and it was cross-posted to net@
(https://lists.freebsd.org/pipermail/freebsd-net/2016-September/046105.html)

gnn@ reported he can reproduce this on 11 as well.

I just checked, and it this behaviour is still present in CURRENT (r322062)

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