ENVS 1200 Lecture 38: ENVS 1200 Lecture 38 Notes
13 May 2018
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ENVS 1200 Lecture 38 Notes – The Operation of IP
Introduction
• The DHCP client resides on the computer or other device that is being connected.
• The client communicates with a DHCP server.
• The IP addresses are a block of addresses reserved for this purpose.
• When a computer is connected to a network, the DHCP client broadcasts a query to
every computer on the network, in order to locate the DHCP server.
• The DHCP server responds with a lease, which includes an IP address, and other
configuration parameters, including the domain name of the network, the IP address of
a local DNS server, a subnet mask to identify other nodes on the local area network, and
the default IP address of the Internet gateway.
• Some DHCP servers also include the addresses of other useful services, such as a time
server.
• The lease is issued for a fixed period of time.
• Most systems allow the DHCP client to renew the lease before it expires.
• This allows the client computer to maintain the same IP address while it is actively
connected to the network.
• Because the IP address is allocated at the time of connection, most computers
connected using DHCP are not used to provide services to other computers on the
network because there is no consistent domain name–IP address link for the computer.
• A companion protocol, Dynamic Domain Name Service, DDNS, can provide this link by
updating the local DNS server.
• DDNS is a documented part of the DNS protocol.
• However, DDNS is rarely used.
• IP performs two major functions
• It routes datagrams from node to node until they reach their destination end node.
• IP addresses are a block of addresses reserved for this purpose.
