DHCP client cannot detect IP address conflict

A DHCP client sends gratuitous ARP packets to check whether addresses conflict after obtaining an IP address and before binding an IP address to the VLANIF interface. However, the VLANIF interface cannot go Up because the VLANIF interface has no IP address. As a result, the physical interface corresponding to the VLANIF interface cannot send gratuitous ARP packets with conflicting IP addresses to the CPU. The DHCP client cannot detect the conflicting IP addresses.
You can configure the DHCP server ping function on the DHCP server to check IP address conflicts. However, when there are many DHCP clients, the cost is high. You need to use it with caution through evaluation.

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