Polycom V2IU Converged Network Appliance 6400-S - Manual (Page 57)

Administrative Options
7 - 11
1. Reconnect the 6400-S to the network by moving the connection from the
Provider port (Port 2) to the Optional Out of Band Ethernet Port (Port 3).
Figure 1. Move the connection from Port 2 to Port 3
2. Restart the system.
Configuring the trusted management addresses
Trusted management addresses, define a list of trusted management host
addresses or network/masks. All other addresses are blocked from accessing
the device.