I need to make it so that when a machine plugs a network cable into my network it can't get an IP via DHCP, but when I register the machine's MAC it can use my NETWORK, how could I do that?
this will limit the assignment of DHCP to the devices. use with caution tho, it can deny DHCP to any devices that should be permitted if they are not reserved ahead of time.
anothet thing, https://docs.fortinet.com/document/fortigate/7.2.0/new-features/59285/add-vci-pattern-matching-as-a-condition-for-ip-or-dhcp-option-assignment-7-2-1 to look for patterns in the dhcp request
another thing if your network supports, would be dot1x ( 802.1x ) with port-security
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