Subject: Re: [manet] transmission failure info from 802.11 cards

From: "David A. Maltz" <[email-masked]>
Date: Mon, 29 Mar 2004 10:02:33 -0500

--On Sunday, March 28, 2004 2:16 PM -0500 Vinayak Naik 
<[email-masked]> wrote:
> In simulators (such as ns-2), a transmission failure at the MAC layer
> results in a callback to the routing layer to try for an alternate route.
> However, with real 802.11 cards in a testbed, is it possible to get
> a feedback about failure of MAC layer delivery?

I'm not sure.  When we built the Monarch testbed back in 1998, the WaveLAN 
cards didn't support 802.11 yet, so we implemented both passive 
acknowledgments and network layer acks.

The Orinoco cards I've played around with since then have a counter for 
failed transmissions, which you could probably poll after sending a packet.

-dam

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