User Manual of NVR2XXX(-P4-P8) Series NVR124The Alarm Host IP refers to the IP address of the remote PC on which the Network Video SurveillanceSoftware (e.g., iVMS-4200) is installed, and the Alarm Host Port must be the same as the alarmmonitoring port configured in the software.Figure 9. 15 Configure Alarm Host4. Click Apply button to save and exit the interface.9.2.6 Configuring MulticastPurpose:The multicast can be configured to realize live view for more than 64 cameras through network for NVR22XXseries NVR.A multicast address spans the Class-D IP range of 224.0.0.0 to239.255.255.255. It is recommended to use the IPaddress ranging from 239.252.0.0 to 239.255.255.255.Steps:1. Enter the Network Settings interface.Menu >Configuration> Network2. Select the More Settings tab to enter the More Settings interface, as shown in Figure 9. 14.3. Set Multicast IP, as shown in Figure 9. 16. When adding a device to the Network Video SurveillanceSoftware, the multicast address must be the same as the NVR’s multicast IP.Figure 9. 16 Configure Multicast4. Click Apply button to save and exit the interface.Note: The multicast function should be supported by the network switch to which the NVR is connected.9.2.7 Configuring RTSPPurpose:The RTSP (Real Time Streaming Protocol) is a network control protocol designed for use in entertainment andcommunications systems to control streaming media servers.Steps: