Re: Blocking outgoing 802.11 ACKs

[Kostas Pelechrinis <kpele_ntua@yahoo.com>]

Hi Ivan,

thanks a lot for the info about the nth module.  Well I know that the quality of the link is going to drop but this is what exactly I want :) I want to force a client "reduce" its rate by not sending ACKs to him.  My concern is that 802.11 ACKs are being handled at the firmware and I do not know if iptables can handle this.  

Anyone knows anything about this?

Thanks a lot,
Kostas


--- On Wed, 1/28/09, Ivan Petrushev <ivanatora@gmail.com> wrote:

> From: Ivan Petrushev <ivanatora@gmail.com>
> Subject: Re: Blocking outgoing 802.11 ACKs
> To: kpele_ntua@yahoo.com
> Cc: netfilter@vger.kernel.org
> Date: Wednesday, January 28, 2009, 6:29 AM
> iptables has "nth" match extension that matches
> every n-th packet. It
> is described in the man page.
> But why would you want to drop ACK packets? That would have
> negative
> impact on your link.
> 
> Ivan.
> 
> On Wed, Jan 28, 2009 at 12:41 PM, Kostas Pelechrinis
> <kpele_ntua@yahoo.com> wrote:
> > Hi all,
> >
> > I have two nodes communicating via their wireless
> interfaces.  Let us assume that node A sends packets to node
> B.  Once node B is receiving the packets, he transmits the
> 802.11 ACK frame.  What I want to do is to prevent node B
> from sending this ACK frames once every two packets for
> example.
> >
> > One indirect way I have thought about is setting the
> following rule to node B:
> >
> > iptables -A INPUT -i ath0 -m limit --limit
> _SPECIFIED-LIMIT_ -s _NODE'S A IP_ -j DROP
> >
> > However,  I am not sure if this prevents the 802.11
> ACKs from being transmitted.  This has to do with the place
> where the above rule is being enforced.
> >
> > Do you have any comments or suggestions on how I can
> achieve what I am trying to?
> >
> > Thanks,
> > Kostas
> >
> >
> >
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