lkml.org 
[lkml]   [2001]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: artificial latency for a network interface
Andreas Schuldei wrote:
>
> 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

yes, that works very well. A userspace app sits on top of the
tun/tap device and pulls out packets, delays them and reinjects
them.

The problem is routing: when you send the packet back to the
kernel, it sends it straight back to you. You need to rewrite
the headers, which is a pain.

A simpler approach is to use policy routing - use the source
and destination devices to override the IP addresses. Works
well. The code is at

http://www.uow.edu.au/~andrewm/packet-delay.tar.gz

It has its own variable bandwidth management as well
as variable latency. It's for simulating narrowband, high
latency connections.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:55    [W:1.282 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site