IPX DDK-1500D - Manual (Page 23)

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If you are using a DHCP server, please select Obtain an IP address automatically. Any
assigned IP address for the connected IP Cameras must be in the same class type as the server.
If there is no DHCP server, please select specify an IP address and type in the IP address of
your PC. This IP address must be different from other network IP devices but in the same class
type.
NOTE: The IP address of a IP CAMERA in a network must be unique to itself as opposed
to those of the other chosen PCs, but in the same class type.