dupliceated icmp echo request

[George Neville-Neil]

On 13 Sep 2016, at 16:39, Hannes Mehnert wrote:

> hello,
>
> (sorry in case this is the wrong mailing list)
>
> while doing some network testing, I discovered that my FreeBSD 
> (r304285,
> but likely earlier + released ones as well) sends out two
> (bytewise-)identical ICMP echo requests shortly after each other when 
> I
> ping the broadcast (IPv4) address on an interface [tested with: 
> tap,em,iwm].
>
> This behaviour does not meet my expectations - is there any specific
> reason for this behaviour; it behaves well (sending out a single ICMP
> echo request) if I ping a unicast host.
>

This got lost in my inbox.  Definitely happens on 11, and I think it's a 
bug.  Looking into it now.  Please create a PR and assign it to me.

Best,
George