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The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on Internet Protocol (IP) networks for automatically assigning IP addresses and other communication parameters to devices connected to the network using a client–server architecture.
In this mode, the client uses the control connection to send a PASV command to the server and then receives a server IP address and server port number from the server, [9] which the client then uses to open a data connection from an arbitrary client port to the server IP address and server port number received. [10]
The IP address of a public server is also important, similar in global uniqueness to a postal address or telephone number. Both IP address and port number must be correctly known by all hosts wishing to successfully communicate. Private IP addresses as described in RFC 1918 are usable only on private networks not directly connected to the internet.