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Date:      Sun, 3 Nov 2002 20:05:15 -0600
From:      Dan Nelson <dnelson@allantgroup.com>
To:        Max Clark <max@mailution.net>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: How to simulate high latency links?
Message-ID:  <20021104020515.GB63929@dan.emsphone.com>
In-Reply-To: <000f01c28399$c2482c60$6445a8c0@princess>
References:  <000f01c28399$c2482c60$6445a8c0@princess>

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In the last episode (Nov 03), Max Clark said:
> Hi,
> 
> I am looking for a way to do some performance testing/tuning in a lab
> environment. I have a high latency low speed link (T1/200MS) that I need
> to replicate.
> 
> Are there any ways to do this with FreeBSD?

dummynet is what you want.  By redirecting traffic through a dummynet
pipe with ipfw, you can simulate latency and packet loss.  See the ipfw
and dummynet manpages.

-- 
	Dan Nelson
	dnelson@allantgroup.com

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