artificial latency for a network interface

[David McWherter]

I once solved this problem using the QoS qdisc facilites:

 http://edge.mcs.drexel.edu/GICL/people/udmcwher/dnt/DNT.html

It works on 2.2 kernels as well.

-david

Andreas Schuldei writes:
 > to simulate a sattelite link, I need to add a latency to a
 > network connection. 
 > 
 > What is the easiest and best way to do that?
 > 
 > I wanted to do that using two tun devices. 
 > I had hoped to have a routing like this:
 > 
 >  <-> eth0 <-> tun0 <-> userspace, waiting queue <-> tun1 <-> eth1
 > 
 > I need to do it this way and not with iptables help, because it
 > needs to work also on 2.2.x kernels.
 > 
 > Now I started experimenting with the tun0 interfaces and got
 > problems: till now I have not succeeded to get a tun0 interface
 > up. the example code (br_select.c) in the package (as found for
 > example on sourceforge) looks fishy and does not work too well. 
 > is it correct that only one /dev/tun file is necessary, but
 > /dev/tun0 and tun1 are opend for reading and writing?

----------------------[=========]------------------------
David T. McWherter                [e-mail]

My religion consists of a humble admiration of the illimitable superior
spirit who reveals himself in the slight details we are able to perceive
with our frail and feeble mind.
		-- Albert Einstein