Operation Manual – DHCPH3C S7500 Series Ethernet Switches Chapter 2 DHCP Server Configuration2-16To do… Use the command… RemarksEnter system view system-view —interface interface-typeinterface-numberdhcp server option code { asciiascii-string | hex hex-string&<1-10> |ip-address ip-address&<1-8> }Configurethe currentinterfacequitConfigurecustomized optionsConfiguremultipleinterfacesin systemviewdhcp server option code { asciiascii-string | hex hex-string&<1-10> |ip-address ip-address&<1-8> }{ interface interface-typeinterface-number [ to interface-typeinterface-number ] | all }RequiredBy default,nocustomizedoption isconfigured2.4 DHCP Security ConfigurationDHCP security configuration is needed to ensure the security of DHCP service.2.4.1 PrerequisitesBefore configuring DHCP security, you should first complete the DHCP serverconfiguration (either global address pool-based or interface address pool-basedDHCP server configuration).2.4.2 Configuring Private DHCP Server DetectingA private DHCP server on a network also answers IP address request packets andassigns IP addresses to DHCP clients. However, the IP addresses they assigned mayconflict with those of other hosts. As a result, users cannot normally access networks.This kind of DHCP servers are known as private DHCP servers.With the private DHCP server detecting function enabled, when a DHCP client sendsthe DHCP-REQUEST packet, the DHCP server tracks the information (such as the IPaddresses and interfaces) of DHCP servers to enable the administrator to detectprivate DHCP servers in time and take proper measures.Follow these steps to enable detection of a private DHCP server:
