Re: Simulating Communications Links

Op zo, 09-10-2005 te 15:40 +0000, schreef Ian Wright:
> 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?

It's simple, you don't need much knowledge about the inner working, just
start from a module that is already written, any target module should
do. This could be helpful too:
http://ebtables.sourceforge.net/ebtables-hacking/ebtables-hacking-HOWTO.html


To use ebtables on a non-bridge, see
http://ebtables.sourceforge.net/examples.html#ex_nobridge

cheers,
Bart




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