Re: Simulating Communications Links

On Sun, 09 Oct 2005 15:40:25 +0000
"Ian Wright" <[email protected]> wrote:

> I'm wondering if anyone can give me a little advice. I'm fairly new to 
> network programming, and completely new to linux, yet it looks like I'm 
> going to have to use both for my final year project at university.
> 
> The requirement that I've been given is basically to delay and drop packets 
> randomly to simulate a communications link. The probability of dropping or 
> delaying a packet will depend on certain variables set by a user (in a GUI 
> if possible) indicating the length of the physical link and the % of network 
> load to network capacity. My project supervisor wants these delayed and 
> dropped packets to occur at the MAC level, and someone suggested using 
> ebtables which I'd never heard of before.
> 
> I'm just wondering how difficult it is to start using ebtables, and how 
> difficult would it be to modify it to create random drops/delays?
> 
> Hopefully what this will allow, is a user to experience the effects of 
> different multiple access schemes, different network loads and different 
> link lengths (eg satellite) via a streamed video.
> 
> Thanks for any help everyone
> 
> Ian W
> 
> 

You don't need ebtables for this, use netem
	see http://linux-net.osdl.org/index.php/Netem

-- 
Stephen Hemminger <[email protected]>
OSDL http://developer.osdl.org/~shemminger


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