[LARTC] Using Token Bucket Filter to simulate a low bandwidth radio link

[Ed Wildgoose]

Nick Howden wrote:

>Hello, 
>
>I am attempting to use the LARTC traffic control to simulate a radio link that 
>has variable bandwidth and availability. The basic bandwidth could be as low 
>as 500 bits/sec but will generally be about 4000 bits/sec. If the simulated 
>radio link is unavailable (zero bandwidth) then packets should be queued 
>until a link is re-established. 
>  
>

Yeah, I think you are going to find it hard to simulate equivalent 
latency as well?

I seem to remember a kernel module for slowing down a link for testing?  
Can't remember the details, but I saw it in my 2.6 kernel somewhere.  
Perhaps check the docs on that.

For my own custom apps I simulated a satellite link simply by writing a 
small proxy program for my particular protocol (in perl and again in 
VB).  It queued packets and released them after a set time period at a 
set rate.  If you are only testing a simple app then this is another way 
to go

Ed W