IP address
An Internet Protocol address (IP address) is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.
An IP address serves two principal functions: host or network interface identification and location addressing.
IP in IP
IP in IP is an IP tunneling protocol that encapsulates one IP packet in another IP packet. To encapsulate an IP packet in another IP packet, an outer header is added with codice_1, the entry point of the tunnel and the codice_2 point, the exit point of the tunnel. While doing this, the inner packet is unmodified (except the codice_3 field, which is decremented). The codice_4 and the codice_5 fields should be copied to the outer packet. If the packet size is greater than the codice_6, the packet is fragmented in the encapsulator, as the outer header should be included. The decapsulator will reassemble the packet.