DHCP_DNS_MASTER=10.15.100.3
DHCP_DNS_SERVERS=10.15.100.3
DHCP_TFTP_SERVER=10.15.100.3
DHCP_ROUTERS=10.15.100.2

DHCP_DOMAIN=example.com
DHCP_SITE_DOMAIN=site1.example.com
DHCP_DYN_IPS_DOMAIN=dhcp.site1.example.com
DHCP_REV_DOMAIN=100.15.10.in-addr.arpa.

DHCP_SUBNET=10.15.100.0
DHCP_NETMASK=255.255.255.0
DHCP_IP_FIRST=10.15.100.50
DHCP_IP_LAST=10.15.100.250
DHCP_BROADCAST=10.15.100.255

DNS_FORWARDER_IP_1=8.8.8.8
DNS_FORWARDER_IP_2=8.8.4.4
DNS_TSIG_KEY_INTERNAL_SECRET=change_it
DNS_TSIG_KEY_EXTERNAL_SECRET=change_it
DNS_TSIG_KEY_RNDC_SECRET=change_it