o MTU of 1500 for wj0 is too big for packet injection to WLAN. Workaround
  is to lower this MTU to 1400 or so :
  
  	~# ifconfig wj0 mtu 1450

  I know I'm lazy guy, I should calcultate the exact value ;) And setting
  the MTU for wj interface when created...

o On some packets, wifitap crashes hard with integer vs. float problem. Did
  not have time to investigate it yet. May be related to Scapy (Gniiiii).
