code: func NetworkLinkUp(iface *net.Interface) error {
  	s, err := getNetlinkSocket()
  	if err != nil {
  		return err
  	}
  	defer s.Close()
  
  	wb := newNetlinkRequest(syscall.RTM_NEWLINK, syscall.NLM_F_ACK)
  
  	msg := newIfInfomsg(syscall.AF_UNSPEC)
  	msg.Index = int32(iface.Index)
  	msg.Flags = syscall.IFF_UP
  	msg.Change = syscall.IFF_UP
  	wb.AddData(msg)
  
  	if err := s.Send(wb); err != nil {
  		return err
  	}
  
  	return s.HandleAck(wb.Seq)
  }
docs: // Bring up a particular network interface.
  // This is identical to running: ip link set dev $name up