(My original work has passed repeated tests. In order to prevent non Users can statically configure an IP address and access other networks. H3C devices support dhcprelay security features. Enabling the DHCP security feature on the VLAN interface will start the legitimacy check of the user address under the VLAN interface. If the corresponding relationship between the user configured IP address and the user's MAC address is not in the user address table of dhcprelay (including the table entries of dhcprelay dynamic records and manually configured user address table entries), dhcprelay will not allow the user to access the external network.)
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