By specifying IP and MAC on a whitelist, DHCP reservations can be synchronized. After creating the whitelist, it is synchronized with the DHCP server, automatically transferring the IP and MAC combinations from the whitelist to the DHCP server's reservation pool. When an IP is removed from the whitelist, the system will automatically delete the corresponding IP and MAC from the DHCP server's reservation pool. Regularly comparing the IPs and MACs in the whitelist, if the system detects a situation where the IP is the same but the MAC is different, it will automatically update the MAC address in the DHCP server's reservation pool to the MAC address in the whitelist to maintain consistency. For IP and MAC combinations present in the DHCP server's reservation pool but not on the whitelist, the system will remove them from the reservation pool, ensuring that only the IP and MAC addresses set in the whitelist are retained in the reservation pool.