Date: Tue, 13 Sep 2016 16:21:36 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: "Hannes Mehnert" <hannes@mehnert.org> Cc: "FreeBSD Net" <freebsd-net@freebsd.org> Subject: Re: dupliceated icmp echo request Message-ID: <8F50E1D1-B17A-4C4C-84E9-60693E637583@lists.zabbadoz.net> In-Reply-To: <ed0692b4-59a8-a918-90d0-2eb204884c98@mehnert.org> References: <ed0692b4-59a8-a918-90d0-2eb204884c98@mehnert.org>
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On 13 Sep 2016, at 15:39, Hannes Mehnert wrote: > hello, > > (sorry in case this is the wrong mailing list) freebsd-net might be better; which I put on CC:. > 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. Asking for a command line seems strange; but given I am replying, is there any delay between the two packets? If you ktrace ping, do you see multiple send calls for the same data? /bz
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