IPADDR6_WB      = '\[(RE:IPADDR6)\]' : 'invalid ipv6 address (did you forget to put it in square brackets?)'
MASK6           = '12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]' : 'invalid ipv6 netmask specified, please specify a value between 0 and 128'
NETWORK6        = '(RE:IPADDR6)/(RE:MASK6)'
                : 'invalid ipv6 network specification, should be a network address followed by a netmask, for instance fe80::/10'
ENETWORK6       = '()|(RE:NETWORK6)'
                : 'invalid ipv6 network specification, should be empty or it should contain a network address followed by a netmask, for instance fe80::/10'
IPV6_LOCALV4    = '(RE:IPADDR)|dynamic' : 'either an IPv4 address or dynamic must be chosen'
IPV6_TUNNEL_TYPE = 'static|sixxs-heartbeat' : 'unknown tunnel type'

FW_NET6         = '(ipv6_net|IPV6_NET)_[1-9]?[0-9]' : ''
FW_ROUTE_NET6   = '(ipv6_route|IPV6_ROUTE)_[1-9]?[0-9]' : ''
FW_NET_IP6      = '(RE:FW_NET6)_(ipaddr|IPADDR)' : ''
FW_NET_DEV6     = '(RE:FW_NET6)_(dev|DEV)' : ''
FW_IF6          = '!?(lo|eth[0-9]+|br[0-9]+|circuit-[-_0-9A-Za-z]+|(RE:FW_NET_DEV6)|pppoe|any|tun[+]|tun[0-9]+|isdn[+]|isdn[0-9]+|i?ppp[+]|i?ppp[0-9]+)'
                : ''
FW_IF_IN6       = 'if:(RE:FW_IF6):any' : ''
FW_IF_OUT6      = 'if:any:(RE:FW_IF6)' : ''
FW_IF_IN_OUT6   = 'if:(RE:FW_IF6):(RE:FW_IF6)' : ''
FW_ICMP6        = '!?(icmpv6|icmpv6:(RE:FW_ICMP_TYPES))' : ''
FW_PROTO6       = 'prot:((!?(tcp|udp|gre|(RE:NUMERIC)))|(RE:FW_ICMP6))'
                : ''
FW_IP6          = '!?((RE:FW_PORTS)|(any|(RE:IPADDR6_WB)(/(RE:MASK6))?|(RE:FW_NET6)|(RE:FW_ROUTE_NET6)|(RE:FW_NET_IP6)|(RE:HOST_REF))(:(RE:FW_PORTS))?)[[:space:]]+'
                : ''
FW_GENERIC_MATCH6= '((RE:FW_TMPL)|(RE:FW_PROTO6)|(RE:FW_LENGTH)|(RE:FW_STATE)|(RE:FW_MAC)|(RE:FW_LIMIT))'
                : ''
FW_INPUT_MATCH6 = '((RE:FW_GENERIC_MATCH6)|(RE:FW_IF_IN6))[[:space:]]+'
                : ''
FW_INPUT_RULE6  = '([[:space:]]*(RE:FW_INPUT_MATCH6)*(RE:FW_IP6){0,2}(RE:FW_ACTION))|dmz-chain'
                : 'please refer to the documentation'
FW_FORWARD_MATCH6= '((RE:FW_GENERIC_MATCH6)|(RE:FW_IF_IN_OUT6))[[:space:]]+'
                : ''
FW_FORWARD_RULE6 = '([[:space:]]*((RE:FW_FORWARD_MATCH6)+)?(RE:FW_IP6){0,2}(RE:FW_ACTION))|dmz-chain|pfwaccess-chain'
                : 'please refer to the documentation'
HOST_IPV6       = '(RE:FW_NET_IP6)|(RE:IPADDR6)' : 'use either an ipv6 address or a reference to one of the IPV6_NET_x-Variables (i.e. IPV6_NET_1_IPADDR)'

+RRDTOOL_SOURCE(OPT_IPV6=~'yes')        = 'ping6' : ''