dns

Windows系统Hosts文件的作用

由 ◇◆丶佛笑我妖孽 提交于 2020-01-18 02:29:07
在Window系统中有个Hosts文件（没有后缀名），在Windows98系统下该文件在Windows目录，在Windows2000/XP系统中位于C:\Winnt\System32\Drivers\Etc 目录中。该文件其实是一个纯文本的文件，用普通的文本编辑软件如记事本等都能打开。 用记事本打开hosts文件，首先看见了微软对这个文件的说明。这个文件是根据TCP/IPforWindows的标准来工作的，它的作用是包含IP地址和Host name(主机名)的映射关系，是一个映射IP地址和Hostname(主机名)的规定，规定要求每段只能包括一个映射关系，IP地址要放在每段的最前面，空格后再写上映射的Host name(主机名)。对于这段的映射说明用“#”分割后用文字说明。 现在让我们来看看Hosts在Windows中是怎么工作的： 在网络上访问网站，要首先通过DNS服务器把网络域名（www.XXXX.com）解析成61.XXX.XXX.XXX的IP地址后，我们的计算机才能访问。要是对于每个域名请求我们都要等待域名服务器解析后返回IP信息，这样访问网络的效率就会降低，而Hosts文件就能提高解析效率。根据Windows系统规定，在进行DNS请求以前，Windows系统会先检查自己的Hosts文件中是否有这个地址映射关系，如果有则调用这个IP地址映射，如果没有再向已知的DNS

Windows系统Hosts文件的作用

由 本小妞迷上赌 提交于 2020-01-18 02:28:32
很多用户都知道在Window系统中有个Hosts文件（没有后缀名），在Windows98系统下该文件在Windows目录，在Windows2000/XP系统中位于C:\Winnt\System32\Drivers\Etc 目录中。该文件其实是一个纯文本的文件，用普通的文本编辑软件如记事本等都能打开。 用记事本打开hosts文件，首先看见了微软对这个文件的说明。这个文件是根据TCP/IPforWindows的标准来工作的，它的作用是包含IP地址和Host name(主机名)的映射关系，是一个映射IP地址和Hostname(主机名)的规定，规定要求每段只能包括一个映射关系，IP地址要放在每段的最前面，空格后再写上映射的Host name(主机名)。对于这段的映射说明用“#”分割后用文字说明。 现在让我们来看看Hosts在Windows中是怎么工作的。 我们知道在网络上访问网站，要首先通过DNS服务器把网络域名（www.XXXX.com）解析成61.XXX.XXX.XXX的IP地址后，我们的计算机才能访问。要是对于每个域名请求我们都要等待域名服务器解析后返回IP信息，这样访问网络的效率就会降低，而Hosts文件就能提高解析效率。根据Windows系统规定，在进行DNS请求以前，Windows系统会先检查自己的Hosts文件中是否有这个地址映射关系，如果有则调用这个IP地址映射

Retrieving ping host name from SendPingAsync result

由 偶尔善良 提交于 2020-01-17 08:04:25
问题 I'm pinging hosts from list of strings (addresses). Everything works perfectly but when host is unreachable ping returns Result.Address : "0.0.0.0" instead of existing address or hostname which I passed into SendPingAsync function. Here is my code: var pingTasks = addresses.Select(address => { return new Ping().SendPingAsync(address); }); await Task.WhenAll(pingTasks); StringBuilder pingResultBuilder = new StringBuilder(); foreach (var pingReply in pingTasks) { pingResultBuilder.Append

Retrieving ping host name from SendPingAsync result

由 拟墨画扇 提交于 2020-01-17 08:04:09
问题 I'm pinging hosts from list of strings (addresses). Everything works perfectly but when host is unreachable ping returns Result.Address : "0.0.0.0" instead of existing address or hostname which I passed into SendPingAsync function. Here is my code: var pingTasks = addresses.Select(address => { return new Ping().SendPingAsync(address); }); await Task.WhenAll(pingTasks); StringBuilder pingResultBuilder = new StringBuilder(); foreach (var pingReply in pingTasks) { pingResultBuilder.Append

Best method to get over cross domain in javascript

由 喜你入骨 提交于 2020-01-17 07:31:17
问题 i have in my localhost:8111 a restlet app running. This app have a ServerResource that respond http requests from a javascript api that i'm doing. This Javascript api is running in my apache in localhost, and i want to do http request to the localhost:8111, but i can't for the cross domain problem. The restlet response in json, which solution is the best in this case? Thanks! 回答1: The same as any other case. CORS if you want control and are willing to sacrifice some cross-browser support.

Best method to get over cross domain in javascript

由 99封情书 提交于 2020-01-17 07:31:10
问题 i have in my localhost:8111 a restlet app running. This app have a ServerResource that respond http requests from a javascript api that i'm doing. This Javascript api is running in my apache in localhost, and i want to do http request to the localhost:8111, but i can't for the cross domain problem. The restlet response in json, which solution is the best in this case? Thanks! 回答1: The same as any other case. CORS if you want control and are willing to sacrifice some cross-browser support.

How do i get my spf to “see past” my isp's non-sense A-record?

由 拟墨画扇 提交于 2020-01-17 05:19:17
问题 I host a spread of different domains that all use my (one) mail-server to send and receive mail. When sending mails, sometimes, my mail gets rejected by the receiving end, marked to the recipient as "suspicious" or simply heads straight for the spam folder. Also, on the inbound, I get a load of "return receipts" from random victims of spam, where one of my domain names has been used even though the mail never touched my mail server. I have been told, that both issues stems from the fact, that

DNS域名解析全过程

由 十年热恋 提交于 2020-01-17 04:21:39
原文链接：https://blog.csdn.net/m0_37812513/article/details/78775629 当一个用户在地址栏输入www.taobao.com时，DNS解析有大致十个过程，如下： 1. 浏览器先检查自身缓存中有没有被解析过的这个域名对应的ip地址，如果有，解析结束。同时域名被缓存的时间也可通过TTL属性来设置。 2. 如果浏览器缓存中没有（专业点叫还没命中），浏览器会检查操作系统缓存中有没有对应的已解析过的结果。而操作系统也有一个域名解析的过程。在windows中可通过c盘里一个叫hosts的文件来设置，如果你在这里指定了一个域名对应的ip地址，那浏览器会首先使用这个ip地址。 但是这种操作系统级别的域名解析规程也被很多黑客利用，通过修改你的hosts文件里的内容把特定的域名解析到他指定的ip地址上，造成所谓的域名劫持。所以在windows7中将hosts文件设置成了readonly，防止被恶意篡改。 3. 如果至此还没有命中域名，才会真正的请求本地域名服务器（LDNS）来解析这个域名，这台服务器一般在你的城市的某个角落，距离你不会很远，并且这台服务器的性能都很好，一般都会缓存域名解析结果，大约80%的域名解析到这里就完成了。 4. 如果LDNS仍然没有命中，就直接跳到Root Server 域名服务器请求解析 5.

Microsoft Azure - Getting a 404 page using custom domain with my web app

由 ☆樱花仙子☆ 提交于 2020-01-17 04:17:49
问题 There's an issue with an Azure website I'm working on where I get an azure 404 page when trying to access my web app (set up with a custom domain) without www. (with www. the site works fine). NS lookup shows that when using the naked domain (infratecheng.com) the results are different than when looking up the full domain (www.infratecheng.com). (source: cassey.org) The custom domain has been set up as per the instructions on the azure portal. I wonder if this is a problem with configuration

why dns.gethotentry() method return addresslist as empty?

由 半腔热情 提交于 2020-01-17 03:40:27
问题 I use the following code to get the IP address: var ip = Dns.GetHostEntry(host); var ipaddress = ip.AddressList.FirstOrDefault(x => x.AddressFamily == AddressFamily.InterNetwork).ToString(); i can able to ping this hostname from command prompt. but when i use GethostEntry() , it return the hostname correctly. but the AddressList is empty. And also it does not working, while i am giving local machine ipaddress. why its happen? 回答1: try using using this code: PHostEntry host; string localIP = "
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