[cisco-voip] How to Introduce variable jitter and delay between A and B

[Jason Burns]

Andrew,

If you know perl and iptables you could modify the script on this page to
introduce a random delay instead of a fixed delay:

http://people.redhat.com/berrange/notes/network-delay.html

<http://people.redhat.com/berrange/notes/network-delay.html>Essentially we
take something off the iptables INPUT (from one or any of your interfaces
configurable by the iptables INPUT rule), and send it to the QUEUE target.
That's where the perl script is waiting to hold onto the packets for some
arbitrary time.

You could also have it drop some small number of packets as well (instead of
sending them to NF_ACCEPT) with a bit more perl scripting.

I actually like this approach compared to other tools I've used just because
I'm more comfortable with Linux and iptables. It could be whipped up quickly
and FREE.

-Jason

On Fri, Feb 25, 2011 at 9:15 PM, Andrew Yerofyeyev <andrew at routeip.net>wrote:

> Hello Team,
>
> Can you recommend software which can simulate variable jitter , delay and
> packet loss between point A and point B ? I looked for Netdisturb (
> http://www.zti-telecom.com/EN/NetDisturb.html) but cannot get it to work .
>
> To get it clear I looking for same software which can be installed on
> server with two network cards (or trunk with two vlans) and can modify
> transit traffic (assume server works as a bridge) to introduce configurable
> delay / packet loss and , what is more important for me , jitter.
>
> Any advices will be highly appreciated.
>
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>
>
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