Delete history of dhcp server ip leases in nethserver 7

[mrmarkuz (Markus Neuberger)]

You could delete the leases in a file:

DHCP Server - how to release leases?

Unless you have overridden it or the client does, the default lease time is only an hour, so they would be released after that. Another way would be to temporarily shut down dnsmasq, remove the entries from /var/lib/dnsmasq/dnsmasq.leases and then re-start dnsmasq. Cheers.