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    var ipv4;
    var iptable = {}
    var ifaces=os.networkInterfaces();
    for (var dev in ifaces) {
      ifaces[dev].forEach(function(details,alias){
        if (details.family=='IPv4') {
            if(details.address !== "127.0.0.1"){
                ipv4 = details.address
            }
          // iptable[dev+(alias?':'+alias:'')]=details.address;
        }
      });
    }