GigE Vision operates with two kinds of traffic. As per Wikipedia:

  • GigE Vision Control Protocol (GVCP): Runs on the UDP protocol. The standard defines how to control and configure devices. Specifies stream channels and the mechanisms of sending image and configuration data between cameras and computers.
  • GigE Vision Stream Protocol (GVSP): Runs on the UDP protocol. Covers the definition of data types and the ways images can be transferred via GigE.

GVCP uses port 3956, GVSP uses a random port between 49152 and 65535.