DHCPHOSTTYPE    = 'hostname|mac'                : 'only hostname or mac are allowed'
DHCP_TYPE       = 'dnsmasq|isc-dhcpd'           : 'only dnsmasq or isc-dhcpd are allowed'
##DHCP_TYPE       = 'dnsmasq'                     : ' only dnsmasq supported as DHCP-Server at moment'
DNS_SPEC        = '_?(RE:DOMAIN)[[:space:]]+(RE:IPADDR)'
                : 'invalid specification for special dns servers, should 
                   be a domain name followed by one ip address'
DNS_DOMAIN      = '_?(RE:DOMAIN)'
                : 'invalid specification for domainpart of special dns servers,
                   should be a domain name'
DNS_NETWORK     = '(RE:NETWORKS)'
                : 'invalid specification for networkpart of special dns servers,
                   should by a ipaddress/netmaskbits'
DNS_LISTEN_IP   = '(RE:FW_NET_IP)|(RE:IPADDR)' : 'use either an ip address or a reference to one of the IP_NET_x-Variables (i.e. IP_NET_1_IPADDR)'
DHCPRELAY_IF    = '(RE:IP_NET_DEV)([[:space:]]+(RE:IP_NET_DEV))*'
                : 'invalid dhcp interface specification, only ethernet/tokenring/bridge devices are allowed'