Re: want to randomly drop packets based on percent

[George Nychis <gnychis@cmu.edu>]

Stephen Hemminger wrote:

> On Mon, 17 Apr 2006 18:30:51 -0400
> George Nychis <gnychis@cmu.edu> wrote:
>
>  
>
> > Stephen Hemminger wrote:
> >
> >    
> >
> > > On Mon, 17 Apr 2006 03:38:33 -0400
> > > George Nychis <gnychis@cmu.edu> wrote:
> > >
> > >
> > >
> > >      
> > >
> > > > Hey,
> > > >
> > > > I'm using the 2.4.32 kernel with madwifi and iproute2 version 
> > > > 2-2.6.16-060323.tar.gz
> > > >
> > > > I wanted to insert artificial packet loss based on a percent so i found:
> > > > network emulab qdisc could do it, so i compiled support into the kernel 
> > > > and tried:
> > > > tc qdisc change dev eth0 root netem loss .1%
> > > >        
>             ^^^^^^
>
> You need to do add not change. Add will set the queue discipline
> to netem (default is pfifo_fast).  Change is for changing netem parameters
> after it is loaded.
>
>  
bahhh I see... the wiki has "change" instead of add.  Now i'm running 
into another problem, I have an XCP qdisc that I have already added via:
tc qdisc add dev ath0 root xcp capacity 54Mbit size 500

therefore when I also try to incorperate loss:
tcq disc add dev ath0 root netem loss .1%

I get:
RTNETLINK answers: File exists

Is it possible to use two qdiscs on the same interface?

Thanks!
George
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