config 'dhcp' 'dhcp_config'
    option 'lan_ip'       '192.168.0.1'
    option 'lan_mask'     '255.255.255.0'
    option 'enable_dhcp'  '1'
    option 'start_ip'     '192.168.0.100'
    option 'end_ip'       '192.168.0.199'
    option 'lease_time'   '7200'
    option 'primary_dns'  '192.168.0.1'
    option 'sec_dns'      '0.0.0.0'
