Subject: Re: bandwidth shaping
To: Steven M. Bellovin <>
From: Luke Mewburn <>
List: netbsd-users
Date: 01/10/2001 14:23:17
On Tue, Jan 09, 2001 at 10:00:08PM -0500, Steven M. Bellovin wrote:
> 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.

Doesn't the new ALTQ stuff provide framework for this type of requirement?

I vaguely recall a recent message about FreeBSD considering replacing
dummynet with ALTQ, but maybe I'm misremembering...