listening 80211 n beacons

[abhinav narain <abhinavnarain10 () gmail com>]

hi,
 I have been running tcpdump on my laptop and openwrt router (netgear).
I have used the command :
iw phy phy1  set channel 40 ht40+/ht40-/ht20

But I have not been able to hear n beacons.
Is it that tcpdump can't decipher n beacons ?
I went through code and saw PRINT_HT_RATES and ieee80211_htrates[] are
defined.
Though in the function print_chaninfo, there are only, a,b ,g taken care of
?

How can I get to know a beacon is of n protocol ?

Abhinav
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