I'm not familiar with the IP object but given it's definition:
    
    
    type IpAddress = object
      case family*: IpAddressFamily ## the type of the IP address (IPv4 or IPv6)
      of IpAddressFamily.IPv6:
          address_v6*: array[0 .. 15, uint8] ## Contains the IP address in 
bytes in
                                        ## case of IPv6
      
      of IpAddressFamily.IPv4:
          address_v4*: array[0 .. 3, uint8] ## Contains the IP address in bytes 
in
                                       ## case of IPv4
    
    
    Run

You should use this:
    
    
    case ip.family
    of IPv6:
      fstream.readData(ip.address_v6[0].addr, ip.address_v6.len)
    of IPv4:
      fstream.readData(ip.address_v4[0].addr, ip.address_v4.len)
    
    
    Run

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