blocks|key|424481|text|这是你可以做的一件事，但无论哪种方式，这都不是确定的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|424482|某些站点会忽略ICMP数据包，因此不会给出ping响应。即使web服务器(或您想要的任何服务)宕机，一些站点也会响应ping。|424483|您可以确定给定站点将提供服务的唯一方法就是使用该服务。没有什么比这更准确的了。|424484|一种更好的方法是提供一系列步骤来检测故障的位置，至少在您可以控制的基础设施中是这样。例如：|424485|424486|允许接收ping并对其执行操作。|unordered-list-item|424487|在web服务器中有一个静态网页。|424488|在应用程序服务器中有一个提供静态内容的动态页。|424489|在使用数据库的应用程序服务器中有一个动态页。|424490|424491|然后，您的测试客户将简单地尝试“联系”这四个点并报告成功情况。由于您希望您的站点大部分时间都处于运行状态，因此我只需检查第四个选项以查看是否一切正常，并仅在发现问题时执行其他检查。|424492|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|K|7|12|8|@]|9|@]|A|$]]|$1|N|3|O|5|K|7|13|8|@]|9|@]|A|$]]|$1|P|3|Q|5|K|7|14|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

That's one thing that you can do but it's by no means a certainty either way.

Some sites will ignore ICMP packets so that no ping response is given. Some sites will respond to pings even when the web server (or whatever service you're after) is down.

The only way you can be certain that a given site will provide a service is to, well, use that service. Nothing else will be as accurate.

A better method would be to provide a series of steps which would detect where a fault lay, at least in the infrastructure that you can control. For example:

<ul>
<li>allow pings to be received and acted upon.</li>
<li>have a static web page in the web server.</li>
<li>have a dynamic page in the application server which delivers static content.</li>
<li>have a dynamic page in the application server which uses the database.</li>
</ul>

Then your tester client would simply attempt to "contact" those four points and report on the success. Since you would expect your site to be up most of the time, I'd just check the fourth option to see if everything was okay, and do the other checks only if a problem were found.

blocks|key|1561613|text|这取决于您如何定义ping。如果你说的是“低水平”的ICMP回声，那么它不太可能是一个很好的指标，表明你的网站是否停机。您最好让一个应用程序从您的站点上拉下一个页面，以确保HTTP服务器正在运行。有很多服务可以做到这一点，你也可以从谷歌下载一些代码。http://www.dailyblogtips.com/test-if-a-website-is-down-for-everyone-or-just-for-your/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1561614|entityMap|0|LINK|mutability|MUTABLE|url|http://www.dailyblogtips.com/test-if-a-website-is-down-for-everyone-or-just-for-your/^0|3H|2D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

It depends on how you define ping. If you're talking about the "low level" ICMP echo, then no it isn't likely to be a good indicator of whether or not your site is down. You would be better off to actually have an application pull a page down from your site to ensure that the HTTP server is running. There are plenty of services for this and likely some code you could download from google as well. <a href="http://www.dailyblogtips.com/test-if-a-website-is-down-for-everyone-or-just-for-your/" rel="nofollow">http://www.dailyblogtips.com/test-if-a-website-is-down-for-everyone-or-just-for-your/</a>

blocks|key|2491979|text|ping可以让您深入了解特定位置的延迟，还可以指出可能的网络问题(数据包丢失)。正如在前面的回答中所说的，一些服务器不响应ping请求，在这种情况下ping是无用的。要从全球50多个地点使用ping检查服务器，请查看此免费工具：http://just-ping.com/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2491980|entityMap|0|LINK|mutability|MUTABLE|url|http://just-ping.com/^0|36|L|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

ping gives you insight in latency from a specific location and also points to possible network issues (packet loss). As said in a previous answer, some servers don't respond to ping requests in which case ping is useless.
To check a server with ping from over 50 locations worldwide have a look at this free tool: <a href="http://just-ping.com/" rel="nofollow">http://just-ping.com/</a>

blocks|key|424601|text|ICMP可以证明服务器是活动的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|424602|TCP检查可以显示web服务器正在工作，但不能显示站点。|424603|要执行站点检查，您应该执行http+GET请求(即使HEAD有时也不工作)，以确保页面是正常的。(返回状态200)|424604|您可以编写自己的检查系统或使用一些第三方网站，如http://allping.net/|offset|length|424605|entityMap|0|LINK|mutability|MUTABLE|url|http://allping.net/^0|0|0|0|O|J|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

ICMP can prove the server is alive.

TCP checking can show the web server is working, but not the site.

To perform site checking, you should do http GET request(even HEAD doesn't work sometimes) to make sure the page was fine.(return status 200)

You can write your own checking system or use some third party site like <a href="http://allping.net/" rel="nofollow">http://allping.net/</a>

I'm trying to write a small website monitoring program, that can check my web hosts to see whether they are down or not, and to calculate the uptime or warn me if it's down. It's going to be a standalone app.

I wanted to know whether pinging is a good way of finding out whether a site is down or not? 

Thanks in advance.

Is pinging to a site a good way of checking whether it's down or not?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试写一个小的网站监控程序，它可以检查我的网络主机，看看他们是否关闭，并计算正常运行时间或警告我，如果它关闭。这将是一个独立的应用程序。我想知道site是否是发现站点是否已关闭的好方法？提前谢谢。

问对站点执行site操作是检查站点是否已关闭的好方法吗？
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问对站点执行site操作是检查站点是否已关闭的好方法吗？EN