Re: Delay packets by 50ms

Linux Advanced Routing and Traffic Control

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On Fri, 2004-10-08 at 15:38 -0700, Anshuman Kanwar wrote:
> Hi all,
> 
> I am trying to solve a tiny problem that is trivial to
> solve using dummynet (FreeBSD). 
> 
> I just want to add a delay of 50ms to each outgoing
> packet from an interface. This is to simulate a large
> pool of multiple modem users so I also need to add b/w
> limits etc (which seems to be easy to do).
> 
> >From the mailing list I could fine 2 qdiscs that can
> simulate latency : "delay" & "netem". Neither of them is
> working on my setup though ( Fedora core2 [2.6.5] or RHEL
> 3.0 update 2 or gentoo [2.6.8] ). Is something special
> needed to enable these qdiscs ?

delay was my earlier name, netem is the current one.

Netem went in to mainline kernel 2.6.8 (also 2.4.27)



> I tried applying the patch
> (http://www.uwsg.iu.edu/hypermail/linux/net/0403.2/0019.h
> tml) and recompiled the kernel but the tc command returns
> "RTNETLINK answers: Invalid argument".

You probably need to build/run newer version of tc 
see http://developer.osdl.org/dev/iproute2

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