In his most recent column in Network Computing, Jay Botelho, discusses how 802.11ac Wave 2 complicates WiFi troubleshooting.
As APs begin implementing MU-MIMO, and the beamforming that must accompany it, capturing the traffic between a single client and AP during the MU-MIMO transfer becomes difficult at best. Since the device being used for capture is not part of the beamforming negotiation, it knows nothing of these optimized data paths, and in most cases it may see packets from several of the simultaneous conversations and interpret the entire MU-MIMO transfer as noise. There are a number of companies that provide dedicated, vendor-agnostic wireless network troubleshooting tools, however MU-MIMO creates new challenges that current tools haven’t overcome so far.
Read the full article here.