Take a look at these links. https://documentation.meraki.com/MR/Encryption_and_Authentication/Meraki_Local_Authentication_-_MR_802.1X https://www.youtube.com/watch?v=39nezpFmvjY
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You cannot release an IP that has already been assigned, but you can make a reservation so that a range of IPs is not assigned. See the documentation. https://documentation.meraki.com/MX/DHCP/DHCP_Services
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