###### Unknown users network subnet 172.31.0.0 netmask 255.255.240.0 { default-lease-time 3600; option domain-name "isp"; option subnet-mask 255.255.240.0; option domain-name-servers 172.31.0.1; option routers 172.31.0.1; range 172.31.0.100 172.31.0.254; }