Focus on log DHCPD: relay information option exists, but giaddr is zero giaddr (Gateway IP Address) is a field within DHCP packets used in DHCP relay scenarios. It contains the IP address of the relay agent (gateway) that forwards the DHCP request from a client to the DHCP server. This helps the DHCP server assign appropriate IP addresses and configuration to clients on different subnets. Add giaddr on the interface that perform DHCP. "ip dhcp relay information trusted giaddr_IP" command, you indicate that the relay agent IP address should be included in DHCP packets as they are forwarded to the DHCP server.