Packetyzer is a highly useful and totally free tool for all LAN managers and administrators. Packetyzer analyzes the different protocols of that LAN, and the activity produced on it.
This fantastic application also comes equipped with tools to capture the distinct packets sent via the LAN. It offers you additional, detailed information on all these packets.
The Packetyzer program supports the following protocols: IEEE 802.11 wireless LAN management frame, IEEE 802.11 wireless LAN, 802.1q Virtual LAN, 802.1x Authentication, etc.