![]() ![]() The newly connected DHCP client does not know the IP address of the DHCP server. Message exchange between the newly connected DHCP client and server For DHCP clients, the DHCP relay agent is the DHCP server for the DHCP server, the DHCP relay agent is a DHCP client.ĭHCP Client Accessing the Network for the First Time Without a DHCP Relay AgentĪs shown in the following figure, when no DHCP relay agent is deployed, the newly connected DHCP client and server exchange DHCP messages through four stages. If a DHCP client and server are on different network segments, a DHCP relay agent must be deployed to forward DHCP messages between them. Only the DHCP server on the same network segment as a DHCP client can receive the DHCPDISCOVER message broadcast by the client. ![]() A DHCP client sends messages to a DHCP server through UDP port 68, and a DHCP server sends messages to a DHCP client through UDP port 67. Similarly, if a network device is upgraded and replaced, no network configuration is required.ĭHCP uses User Datagram Protocol (UDP), as its transport protocol. The DHCP server is configured with the new information and the information will be propagated to the new endpoints. For example, an organization may want to change its IP addressing scheme from one range to another. Efficient change management: The use of DHCP makes it very simple to change addresses, scopes, or endpoints.DHCP allows this to be automated and centralized so network professionals can manage all locations from a single location. Keeping track of which device has what IP address can be an exercise in futility as it is nearly impossible to understand when devices require access to the network and when they leave. Automatic IP address management: In any network without DHCP, network administrators need to manually assign and withdraw IP addresses.The use of DHCP ensures that each IP address is used only once. ![]() This can happen when IP addresses are allocated manually, particularly when there are a large number of endpoints that only connect periodically, such as mobile devices. If an IP address conflict occurs between two devices, one or both of the devices cannot be connected. However, each IP address can be used only once.
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