Principles of the DHCP proxy feature

Only after the Dynamic Host Configuration Protocol (DHCP) Layer 3 relay function is enabled, an access device supports the DHCP proxy function and can use it on user ports and cascade ports.

Server ID proxy: Option 54 in DHCP packets is called server identifier (server ID), and its value is the IP address of the DHCP server. This field is used to identify the DHCP server. Server ID proxy is a function for modifying the option 54 field in a DHCP packet so that the IP address of the DHCP server is unavailable to the client. This prevents the attacks initiated by the DHCP client to the DHCP server.
Lease time proxy: The lease time of the IP address requested by the client is related to options 51, 58, and 59 in the DHCP packet. Lease time proxy is a function for modifying these options in a DHCP packet so that a lease time which is shorter than that directly allocated by the DHCP server is available to the client. This facilitates the lease time management.

For more information, visit Huawei technical support website.

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