[ns] [Bug Report] ETHER_ADDR(dh->dh_ta) Error in Mac-802_11.cc

[Ting Wang]

Hi:
      Today during the simulation I found out that with CTS and ACK
packet dh->dh_ta is set the same as dh->dh_ra.
     We may change them in mac-802_11.cc  sendCTS() and sendACK(). 
      
     regards
                                                             tingwang