[LARTC] Delay packets by 50ms

[Anshuman Kanwar]

Hi Stephen,

Getting the latest iproute2 solved my problem.

Thanks!=20

-----Original Message-----
From: Stephen Hemminger [mailto:shemminger@osdl.org]=20
Sent: Friday, October 08, 2004 3:55 PM
To: Anshuman Kanwar
Cc: lartc@mailman.ds9a.nl
Subject: Re: [LARTC] Delay packets by 50ms

On Fri, 2004-10-08 at 15:38 -0700, Anshuman Kanwar wrote:
> Hi all,
>=20
> I am trying to solve a tiny problem that is trivial to
solve using=20
> dummynet (FreeBSD).
>=20
> I just want to add a delay of 50ms to each outgoing
packet from an=20
> interface. This is to simulate a large pool of multiple
modem users so=20
> I also need to add b/w limits etc (which seems to be
easy to do).
>=20
> >From the mailing list I could fine 2 qdiscs that can
> simulate latency : "delay" & "netem". Neither of them
is working on my=20
> setup though ( Fedora core2 [2.6.5] or RHEL 3.0 update
2 or gentoo=20
> [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=20
> answers: Invalid argument".

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