Is it possible the devices you are pinging are sleeping using wireless power management?

http://en.wikipedia.org/wiki/Wireless_Multimedia_Extensions

This will cause devices to deliberately turn off the radio and ask the AP to queue packets until they poll.

On Tuesday, September 3, 2013, Jason White wrote:
Trent W. Buck <trentbuck@gmail.com> wrote:
> Jason White <jason@jasonjgw.net> writes:
>
> A quick look at OpenWRT's sources (/lib/wifi/mac80211.sh) show how to
> find out what caps your card+driver has:
>
>     root@widow:~# iw phy phy0 info | grep Capabilities:
>     Capabilities: 0x104e
>
> ...which is a XORed list

Thanks. This is exactly what I needed.

Mine gives 0x11ef

0001000111101111
if I remember my number bases correctly.

Now given your list:
       1 LDPC yes
      16 GF no
      32 SHORT-GI-20 yes
      64 SHORT-GI-40 yes
     128 TX-STBC yes
     768 RX-STBC1 no
     768 RX-STBC12 no
     768 RX-STBC123 no
    4096 DSSS_CCK-40 yes


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