Description of the GIADDR field in DHCP packets

For S series switches, the giaddr field in DHCP packets has the following function:
The giaddr field (gateway IP address) indicates the IP address of the first DHCP relay agent that DHCP packets pass through. If the DHCP server and client are located on different network segments, the first DHCP relay agent fills its IP address into this field of the DHCP Request packet sent by the client and forwards the packet to the DHCP server. The DHCP server determines the network segment where the client resides based on this field, and allocates an IP address on this network segment from an address pool.

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