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Date: Wed, 24 Dec 2008 16:00:39 +0200
From: "Yony Yossef" <yonyossef.lists@gmail.com>
To: freebsd-net@freebsd.org
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Cc: eitans@mellanox.co.il, Yehonatan Yossef <yoniy@mellanox.co.il>,
	liranl@mellanox.co.il, yevgenyp@mellanox.co.il
Subject: net.inet.udp.blackhole issue
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X-List-Received-Date: Wed, 24 Dec 2008 14:00:40 -0000

Hi All,

I'm facing lots of UDP "Connection refused" errors while running
multistream iperf test.
Analyzing it with wireshark showed several "ICMP Port Unreachable" problems.

I've overriden it with "sysctl net.inet.udp.blackhole=1", but I'm not
sure this is the correct thing to do, I feel like I've sweeped the
problem under the carpet.

PS - I see similar failures with TCP bidirectional iperf test, it can
also be overriden by "sysctl net.inet.tcp.blackhole=1".

My question is -
can it be a NIC problem?
If so, how can a driver problem cause an iperf UDP socket to be in a
"non listening state"?

Thanks,
Yony