Sherman Jeff A, Levine Judah
National Institute of Standards and Technology, Boulder, CO 80305.
JILA, University of Colorado, Boulder, CO 80309.
J Res Natl Inst Stand Technol. 2016 Mar 8;121:33-46. doi: 10.6028/jres.121.003. eCollection 2016.
The Internet Time Service (ITS) at the National Institute of Standards and Technology (NIST) currently receives over 16 billion time requests per day. ITS servers derive their system time from the NIST atomic-referenced time scale and distribute it freely to the public. Here we explore ITS usage patterns discovered by analysis of inbound network traffic. For example, over a period of four weeks, just two of the ≈ 20 ITS servers received requests from 316 million unique Internet Protocol (IPv4) addresses, which is at least 8.5 % of the entire Internet. We offer recommendations for networked device/software manufacturers, and providers and consumers of network time services.
美国国家标准与技术研究院（NIST）的互联网时间服务（ITS）目前每天接收超过160亿次时间请求。ITS服务器从NIST原子参考时间尺度获取系统时间，并将其免费提供给公众。在此，我们通过分析入站网络流量来探究ITS的使用模式。例如，在四周的时间里，约20台ITS服务器中只有两台接收到来自3.16亿个唯一互联网协议（IPv4）地址的请求，这至少占整个互联网的8.5%。我们为联网设备/软件制造商以及网络时间服务的提供商和消费者提供建议。
