Samsung SNP-6321H Network Setup Manual page 24

network configuration
DDNS
Server
Network camera1
Setting up Port Range Forward for several network cameras
When several network cameras are connected to one Broadband Router device, you should forward the TCP
943 port of the router to the TCP 943 port of a connected camera.
User
Internet
M 
TCP 943 port is a port for the Silverlight policy server of a camera, you cannot change the Silverlight policy server port
of a camera.

Set manually in router setup menu to set port forwarding.
Port forwarding can be done without additional router setup if the router supports the UPnP (Universal Plug and Play)
function.
After connecting the network camera, set <Quick connect> of <Samsung DDNS> to <On> in the "Setup 
Network  DDNS" menu.
24_ network configuration
External remote
monitoring PC
Internet
Modem
Router
...
Network camera n
Broadband Router
Start End Protocol
943 943 TCP
3000 3000 TCP/UDP
3001 3001 TCP/UDP
4520 4520 TCP/UDP
4521 4521 TCP/UDP
8080 8080 TCP/UDP
8081 8081 TCP/UDP
Camera1 (192.168.1.100)
IP Address
192.168.1.100
Policy Server Port
192.168.1.100
192.168.1.101
Camera2 (192.168.1.101)
192.168.1.100
192.168.1.101
192.168.1.100
192.168.1.101
Policy Server Port
HTTP Port
8080
Device port
4520
RTSP Port
3000
943
HTTP Port
8081
Device port
4521
RTSP Port
3001
943