A DHCP server offers configuration parameters (such as an IP address, a MAC address, a domain name, and a lease for the IP address) to the client in a DHCPOFFER unicast message. The client, Host A, sends a DHCPDISCOVER broadcast message to locate a DHCP server. The figure below shows the basic steps that occur when a DHCP client requests an IP address from a DHCP server. A DHCP client is an Internet host using DHCP to obtain configuration parameters such as an IP address. Information About the DHCP ClientĭHCP provides a framework for passing configuration information to hosts on a TCP/IP network. However, unicast packets to the other end will fail because there is no ATM map entry and thus DHCP renewals and releases also fail. Inverse ARP is supported only for the aal5snap encapsulation type.įor multipoint interfaces, an IP address can be acquired using other encapsulation types because broadcast packets are used. Inverse ARP, which builds an ATM map entry, is necessary to send unicast packets to the server (or relay agent) on the other end of the connection. For ATM multipoint interfaces, the DHCP client is supported using only the aal5snap encapsulation type combined with Inverse Address Resolution Protocol (ARP). The DHCP client works with ATM point-to-point interfaces and will accept any encapsulation type. The DHCP client can be configured on Ethernet interfaces and on PPP over ATM (PPPoA) and certain ATM interfaces. Restrictions for Configuring the DHCP Client To access Cisco Feature Navigator, go to An account on is not required. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document. For the latest feature information and caveats, see the release notes for your platform and software release. Your software release may not support all the features documented in this module. It includes information on the Cisco DHCP FORCERENEW feature, which provides entity authentication and message authentication. This module describes the concepts and tasks needed to configure the Cisco IOS DHCP client. A DHCP client is defined as an Internet host using DHCP to obtain configuration parameters such as an IP address. Feature Information for the DHCP ClientĬisco IOS Dynamic Host Configuration Protocol (DHCP) client software provides the flexibility to include various configuration options for the DHCP client.Example Configuring an ATM Point-to-Point Subinterface Using aa15mux PPP Encapsulation.Example Configuring an ATM Point-to-Point Subinterface Using aa15nlpid Encapsulation.Example Configuring an ATM Point-to-Point Subinterface Using aa15snap Encapsulation.
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