code: func findIfaceDstName(sb *sandbox, ep *endpoint) string {
  	srcName := ep.Iface().SrcName()
  	for _, i := range sb.osSbox.Info().Interfaces() {
  		if i.SrcName() == srcName {
  			return i.DstName()
  		}
  	}
  	return ""
  }
docs: // Searches the OS sandbox for the name of the endpoint interface
  // within the sandbox.   This is required for adding/removing IP
  // aliases to the interface.