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If the DHCP server cannot be pinged through, check the network connection and routing configurations.
Contact the administrator of the DHCP server to check whether the network extension user is assigned with an IP address. If the user is not assigned with an IP address, contact the administrator of the DHCP server to re-configure the DHCP server.
The IP addresses in the virtual IP address pool cannot be the IP address of the virtual gateway or the interface. Make sure that the IP address assigned on the DHCP server or from the address pool is not identical with that of the virtual gateway or the interface.
Cause one: There is no reachable route between the virtual gateway and the DHCP server.
Cause two: The DHCP server is not assigned with an IP address.
Cause three: The virtual IP address (for network extension) assigned on the DHCP server or from the address pool conflicts with other IP addresses on the device, which results in the assignment failure.
Cause four: The DHCP client service in the OS of the user PC is disabled.
Cause five: No IP address in the address pool can be assigned.