ddns-update-style none; subnet 192.168.75.0 netmask 255.255.255.0 { option routers 192.168.75.1; option subnet-mask 255.255.255.0; option domain-name-servers 192.168.75.1; range 192.168.75.10 192.168.75.100; default-lease-time 21600; max-lease-time 43200; }
systemctl restart dhcp-server
service dhcp-server restart