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For the proper functioning of TCP/IP, the following has to be configured:
IP address: IP address is a 4 byte (32 bit) number that uniquely identifies a computer on an IP inter-network. The IP address is a must if the computer is in a network. Each interface has to be configured on each TCP/IP node like a host or router with a unique IP address that is correct for the attached network segment.
Subnet mask: This 32 bit value is a required configuration item. The subnet mask must be configured for each interface on each TCP/IP node (host or router) with a subnet mask such that when combined with the IP address, yields the network ID. All IP interfaces on the same network segment must use the same network ID. Therefore, all IP interfaces on the same network segment must use the same subnet mask.
Default gateway: To communicate with TCP/IP nodes on other network segments, at least one interface with the IP address of a default gateway (a local router that forwards remote TCP/IP traffic to its destination) must be configured. Default gateway for a network that consists of a single network segment need not be configured.
