Module that exposes functions to get information on the current 
  interfaces enabled in ntop.
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          | numInterfaces() Get number of configured interfaces
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    | String @return the name of the interface | 
        
          | name() Get interface name
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    | String @return the unique name of the interface | 
        
          | uniqueName() Get unique interface name
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    | String @return the human-friendly name of the interface | 
        
          | humanName() Get human-friendly interface name
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    | string | 
        
          | ipv4(interfaceId) Get interface address (IPv4)
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    | string | 
        
          | network(interfaceId) Get network and mask to which the interface belongs
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    | number | 
        
          | numHosts(interfaceId) Get the number of hosts active on this interface
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    | string | 
        
          | ipv6(interfaceId) Get interface address (IPv6)
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    | dictionary @return {'startTime':number, 'firstSeen': number, 
      'lastSeen': number} | 
        
          | time(interfaceId) Get interface time
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          | virtual() Check if this is a virtual interface
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          | speed() Interface speed (0 if unknown)
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          | mtu() Get interface MTU size
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          | bpf() Get BPF filter set for this interface (if any)
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          | pktsStats() Get packet statistics
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          | fcPktsStats() Get FC pkts stats
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          | fcBytesStats() Get FC byte stats
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          | bytesStats() Get bytes statistics
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          | icmpStats() Get ICMP stats
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          | securityPkts() Get information about security packets
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          | netflowStats() Get NetFlow interface information
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          | sflowStats() Get sFlow interface information
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          | cpacketStats() Get cPacket counter information
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