The basic protocol for sending data over the Internet network and many other computer networks is the Internet Protocol (IP). The protocol specifies that each IP packet must have a header which contains, among other things, the IP address of the sender of the packet. The source IP address is normally the address that the packet was sent from, but the sender 's address in the header can be altered, so that to the recipient it appears that the packet came from another source. The protocol requires the receiving computer to send back a response to the source address, so that spoofing is mainly used when the sender can anticipate the network response or does not care about the response.
what is the difference between an ip packet and an ip address
The protocol specifies that each IP packet must have a header which contains, among other things, the IP address of the sender of the packet.