Subject: Re: bandwidth shaping
To: Yubyub bird <>
From: Steven M. Bellovin <>
List: netbsd-users
Date: 01/09/2001 22:00:08
In message <>, Yubyub 
bird writes:
>I am in need of a way to _introduce_ delays in a network.  Basically, we
>have to test a few different protocols and how they react to added
>latencies at high bandwidth.
>Every piece of networking knowledge that I know of relates somehow to
>decreasing latency and delays.  Is there a piece of functionality in
>NetBSD (such as a traffic shaper) that will allow me to introduce a delay
>while maintaining a high bandwidth?  Possibly with adjustable bandwidth
>(so I could, say, emulate an international E1 or such)?
It would be really nice (hint, hint) if someone would port the dummynet 
code from FreeBSD -- I think it would do exactly what you want.

Failing that, it should be easy enough to write something using the 
tunnel driver.

		--Steve Bellovin