[Guy Harris <gharris@xxxxxxxxx>]

David L�pez P�rez wrote:

> I send an ICMP packet (ping) and I receive the the corresponding 
> immediate acknowledgement

That's an 802.11-layer acknowlegment, not an ICMP acknowledgment.

For a display filter, I think you could filter on the frame type.  I 
don't know what the right filter would be.

A capture filter could also be constructed, but you'd have to look at 
the raw bytes of the 802.11 header - the libpcap parser doesn't know 
about 802.11 frame types.