2-22z Define new DHCP options. New configuration options will come out with DHCP development. Tosupport new options, you can add them into the attribute list of the DHCP server.z Extend existing DHCP options. When the current DHCP options cannot meet customers’requirements (for example, you cannot use the dns-list command to configure more than eightDNS server addresses), you can configure a self defined option for extension.Follow these steps to customize the DHCP service:To do… Use the command… RemarksEnter system view system-view —interface interface-type interface-numberdhcp server option code { asciiascii-string | hex hex-string&<1-10> |ip-address ip-address&<1-8> }Configure thecurrent interfacequitConfigurecustomizedoptionsConfiguremultipleinterfaces insystem viewdhcp server option code { asciiascii-string | hex hex-string&<1-10> |ip-address ip-address&<1-8> } { interfaceinterface-type interface-number [ tointerface-type interface-number ] | all }RequiredBy default, nocustomizedoption isconfigured.Be cautious when configuring self-defined DHCP options because such configuration may affect theDHCP operation process.Configuring DHCP Server Security FunctionsDHCP security configuration is needed to ensure the security of DHCP service.PrerequisitesBefore configuring DHCP security, you should first complete the DHCP server configuration (eitherglobal address pool-based or interface address pool-based DHCP server configuration).Enabling Unauthorized DHCP Server DetectionIf there is an unauthorized DHCP server in the network, when a client applies for an IP address, theunauthorized DHCP server may assign an incorrect IP address to the client.With this feature enabled, when receiving a DHCP message with the siaddr field not being 0 from aclient, the DHCP server will record the value of the siaddr field and the receiving interface. Theadministrator can use such information to check out any DHCP unauthorized servers.Follow these steps to enable unauthorized DHCP server detection:To do… Use the command… RemarksEnter system view system-view —
