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dnsmasq keeps track of the DHCP leases it has in a file which is defined by the dhcp-leasefile config option.

To delete a lease from dnsmasq, first stop dnsmasq.

$ sudo systemctl stop dnsmasq

Remove the lease from the file. On Ubuntu this lease file defaults to /var/lib/misc/dnsmasq.leases.

Once the lease is removed, start dnsmasq.

$ sudo systemctl start dnsmasq

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