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      1 ipmap :: = mapblock | redir | map .
      2 
      3 map ::= mapit ifname ipmask "->" ipmask [ mapport | mapicmpid ] .
      4 map ::= mapit ifname fromto "->" ipmask [ mapport | mapicmpid ] .
      5 mapblock ::= "map-block" ifname ipmask "->" ipmask [ ports ] .
      6 redir ::= "rdr" ifname ipmask dport "->" ip [ "," ip ] [ ports ] options .
      7 
      8 dport ::= "port" portnum [ "-" portnum ] .
      9 ports ::= "ports" numports | "auto" .
     10 mapit ::= "map" | "bimap" .
     11 fromto ::= "from" object "to" object .
     12 ipmask ::= ip "/" bits | ip "/" mask | ip "netmask" mask .
     13 mapport ::= "portmap" tcpudp portnumber ":" portnumber .
     14 mapicmpid ::= "icmpidmap" icmp idnumber ":" idnumber .
     15 options ::= [ tcpudp ] [ rr ] .
     16 
     17 object  = addr [ port-comp | port-range ] .
     18 addr    = "any" | nummask | host-name [ "mask" ipaddr | "mask" hexnumber ] .
     19 port-comp = "port" compare port-num .
     20 port-range = "port" port-num range port-num .
     21 
     22 rr ::= "round-robin" .
     23 tcpudp ::= "tcp" | "udp" | "tcp/udp" .
     24 portnumber ::= number { numbers } | "auto" .
     25 idnumber ::= number { numbers } .
     26 ifname ::= 'A' - 'Z' { 'A' - 'Z' } numbers .
     27 
     28 numbers ::= '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' .
     29