Why do we need dhcp server

Implementing Congestion Control. You must be careful to assign unique IP addresses to each client and to configure each client individually.

If a client moves to a different network, you must make manual modifications for that client. Clients can move to other subnets without manual reconfiguration because they obtain, from a DHCP server, new client information appropriate for the new network. Centralized network client configuration — You can create a tailored configuration for certain clients, or for certain types of clients.

The configuration information is stored in one place, in the DHCP data store. You do not need to log in to a client to change its configuration. You can make changes for multiple clients just by changing the information in the data store. Support of local clients and remote clients — BOOTP provides for the relaying of messages from one network to another network. The DHCP server can give a client all the information that the client needs to function, including IP address, boot server, and network configuration information.

RARP booting requires that each subnet have a boot server. The DHCP server uses multithreading to process many client requests simultaneously. The server also supports data stores that are optimized to handle large amounts of data. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.

Without DHCP, IP addresses for new computers or computers that are moved from one subnet to another must be configured manually; IP addresses for computers that are removed from the network must be manually reclaimed.

With DHCP, this entire process is automated and managed centrally. Because the IP addresses are dynamic leased rather than static permanently assigned , addresses no longer in use are automatically returned to the pool for reallocation. The DHCP server stores the configuration information in a database that includes:. Valid IP addresses, maintained in a pool for assignment to clients, as well as excluded addresses.

The lease duration, or the length of time for which the IP address can be used before a lease renewal is required. Reliable IP address configuration. IP address in Expired state in the address pool, that is, the IP address that has been assigned to the client and whose lease has expired. Random IP address in Idle state in the address pool. For example, if This helps prevent IP address conflicts. If so, the DHCP relay agent discards the message.

If not, the DHCP relay agent increases the value by 1 and proceeds to the following operations. Checks whether the value of the giaddr field in the message is 0. If not, the DHCP relay agent does not change the field and proceeds to the following operations. If so, the DHCP relay agent proceeds to the following operations. If not, the DHCP relay agent discards the message. Checks whether the value of the flags field is 1. Client renewing the address lease through a DHCP relay agent. Related Topics.

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