dns

What does Dns.GetHostEntry Method(String) actually do?

由 纵然是瞬间 提交于 2019-12-21 12:01:34
问题 I can't find any proper description in the documentation for what this actually does. Does it check for the existence of A records or CNAME records or both? My understanding is that in .NET 4, this throws a SocketException if the host does not exist, and this is confirmed by my testing. 回答1: This is the list of addresses returned by var ips = System.Net.Dns.GetHostEntry("microsoft.com").AddressList; foreach (var ip in ips) Console.WriteLine(ip); // output 64.4.11.37 65.55.58.201 And these are

Problem with System.Net.Dns.GetHostEntry(dnsServer) on .NET 4.0

由 我怕爱的太早我们不能终老 提交于 2019-12-21 09:33:27
问题 I have been using the following code for months (without problem) in a .NET 2.0/3.5 environment: string server="192.168.1.3"; IPHostEntry ipe = System.Net.Dns.GetHostEntry(server); IPAddress ipa = ipe.AddressList[0]; IPEndPoint ipep = new IPEndPoint(ipa, (int)UdpServices.Domain); Here, server is hardcoded to an IP address, but in my application it could potentially be something like "server.test.com". When converting my project to .NET 4.0, this code stopped working when directly passing an

DNS query in JAVA

由 旧街凉风 提交于 2019-12-21 09:29:45
问题 I am messing around with DNS services in Java - I am specifically trying to lookup all google.com addresses and display them in an array, similar to running a lookup using nslookup: nslookup -q=TXT _netblocks.google.com 8.8.8.8 I am using InetAddress for this but keep on getting exception errors. Since the errors refer to 'Unknown Host' I don't think InetAddress can read TXT records (if I use google.com it works, but that does't show the full IP Range). Below is my code: InetAddress dnsresult

Non-English domain naming issues in programming

由 ≯℡__Kan透↙ 提交于 2019-12-21 09:18:38
问题 Most programming code, I imagine is written in English. But I'm curious how people are handling the issue of naming herein. A lot of programming is done within some bussiness domain, usually with well established terms for certain procedures, items. I'm from Denmark for instance, and something I work a lot with has a term called "indblikskode", which sort of translates to "insight code". So, do I use the line "string indblikskode = ..." in the C# code for some web service related to this? Or

file_get_contents(): php_network_getaddresses: getaddrinfo failed

由 落爺英雄遲暮 提交于 2019-12-21 07:35:08
问题 I'm trying to update some values from one server to another server with a cron job. I use file_get_contents(). The strange thing is that this fails occasionally. One minute it works, another minute it won't work. I receive these two errors: PHP Warning: file_get_contents(): php_network_getaddresses: getaddrinfo failed: Name or service not known PHP Warning: file_get_contents(): failed to open stream: php_network_getaddresses: getaddrinfo failed: Name or service not known and: PHP Warning:

How do I CURL www.google.com - it keeps redirecting me to .co.uk

由 时间秒杀一切 提交于 2019-12-21 07:20:10
问题 I am using CURL to check for the existence of a URL (HEAD request) but when I test it with www.google.com , it redirects me to www.google.co.uk - probably because my server is UK-based. Is there a way you can stop this from happening? I don't want to remove the CURLOPT_FOLLOWLOCATION option as this is useful for 301 redirects etc. Part of my code is below; $ch = curl_init(); // set URL and other appropriate options curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER,

How do I CURL www.google.com - it keeps redirecting me to .co.uk

由 匆匆过客 提交于 2019-12-21 07:20:03
问题 I am using CURL to check for the existence of a URL (HEAD request) but when I test it with www.google.com , it redirects me to www.google.co.uk - probably because my server is UK-based. Is there a way you can stop this from happening? I don't want to remove the CURLOPT_FOLLOWLOCATION option as this is useful for 301 redirects etc. Part of my code is below; $ch = curl_init(); // set URL and other appropriate options curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER,

centos的DNS服务工作流程及搭建

由 别说谁变了你拦得住时间么 提交于 2019-12-21 07:06:00
1 什么是DNS？　 　　DNS（Domain Name Server，域名服务器）即域名解析服务，是进行域名(domain name)和与之相对应的IP地址 (IP address)转换的服务器。DNS中保存了一张域名(domain name)和与之相对应的IP地址 (IP address)的表，以解析消息的域名。 域名是Internet上某一台计算机或计算机组的名称，用于在数据传输时标识计算机的电子方位（有时也指地理位置）。域名是由一串用点分隔的名字组成的，通常包含组织名，而且始终包括两到三个字母的后缀，以指明组织的类型或该域所在的国家或地区。 2 DNS工作方式 　　递归查询 #若域名服务器不能直接回答，则域名服务器会在域各树中的各分支的上下进行递归查询，最终将返回查询结果给客户机，在域名服务器查询期间，客户机将完全处于等待状态。 　　迭代查询 #根据客户机向非权威域名服务器提交域名解析查询请求后，逐级进行查询直到查到结果或者没有得到结果，都将最终结果传送给客户机的行为。 　　说明：假设你要寻找一家你从未去过的公司，你会有2种解决方案，1是找一个人替你问路，那可能是你的助手，2是自己问路，每走过一个路口，就问一个人，这就好比递归查询和迭代查询，递归查询在这里代表你的第1种解决方案，而迭代则是第2种解决方案。 3 DNS应用层协议及端口 　　使用的协议有两种，TCP和UDP协议

How do I find the DNS servers in Android from a Java program?

由 只谈情不闲聊 提交于 2019-12-21 07:04:21
问题 The java.net.InetAddress.GetByName(String host) method can only return A records so to lookup other record types I need to be able to send DNS queries using the dnsjava library. However that normally relies on being able to parse /etc/resolv.conf or similar to find the DNS server addresses and that doesn't work on Android. The current DNS settings on Android can apparently only be obtained from within a shell by using the getprop command. Can anyone tell me how to get those settings from Java

Sending Email using IP Address instead of Domain Name

由 人走茶凉 提交于 2019-12-21 06:58:07
问题 I am trying to avoid running through DNS servers to get an email message to an address on one of my hosted virtual accounts. I know I can surround the IP address with square brackets but how do I designate the mailbox username for the (virtual) hosted account on the server? In other words, I have multiple domains hosted on a virtual server -- all sharing the same IP address obviously, user@domain.com works fine but how do I send to user@[123.456.78.90] Is what I want to do, possible? Thanks.
订阅 dns