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Date: Mon, 5 Oct 2009 19:46:36 +0800
From: Eugene Grosbein <eugen@kuzbass.ru>
To: rihad <rihad@mail.ru>
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Cc: freebsd-net@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it>
Subject: Re: dummynet dropping too many packets
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On Sun, Oct 04, 2009 at 08:28:59PM +0500, rihad wrote:

> Thanks for the tip. although I took an easier route by simply doing 
> "ipfw add allow ip from any to any" before the pipe rules, and the buf 
> drop rate instantly became 0. So the problem is dummynet/ipfw.

You should also estimate volume of non-TCP traffic
that is generally has not flow control capabilities of TCP.

Or, try something like this:

ipfw add 100 skipto 200 tcp from any to any	# direct only TCP to dummynet
ipfw add 150 allow ip from any to any		# pass non-TCP
ipfw add 200 ... 				# here dummynet rules go

And take a look at drop counters.

Eugene Grosbein