how to dns lookup

Step 1,Enter the URL in the browser Step 2,The browser looks for the IP address of the domain name, indicating, The first step in the navigation is to find the IP address of the accessed domain name. The DNS search process is as follows: Browser

I don't know if I have ever sent it. I will forward it again. Sniffer is a common method for collecting useful data. The data can be user accounts and passwords, or commercial confidential data. sniffer can be used as a device to capture network

Datagram plays a very important role in the Internet. In order to improve the internal functions of network programming, it is necessary to gain a deeper understanding of IP datagram. Version: The four digits indicate the Protocol version used by

Last night, I translated the article "How to make your website really fast". Anders Liu said the content of "high-performance website construction Guide. Then I searched for a High-Performance website. The author of the book "High Performance Web

Http://techrepublic.com.com/5100-10877_11-6029680.html? Tag = NL. e116 Manage the DNS Client Cache in Windows 2000 proManage DNS Client caching in Windows 2000 pro By Jim BoyceAuthor: Purple endurerKeywords: Windows 2000 | Microsoft Windows | Domain

Introduction to the previous chapterWebServerApacheThe architecture and principlesApacheInstallation (LinuxAs follows: Http://www.cnblogs.com/fnng/archive/2012/08/30/2662984.html So this section will share someApachePerformance monitoring.  

--SSH service/Etc/init. d/sshd -- sshd service startup script[Root @ Li ~] # Netstat-ntlup | grep sshdTCP 0 0: 22: * Listen 2804/sshdVim/etc/ssh/sshd_config -- configuration fileCP/etc/ssh/sshd_config/etc/ssh/sshd_config.bak -- make a backup# Port 22

1. Ubuntu power management: Ubuntu power management is not so rich and friendly. There are two problems: 1) When battery mode is used, the screen brightness is automatically reduced. Solution: in system-preference-power management, set it. 2) When

What makes Apache faster and How to Make PHP the most effective? Document options

How to solve the connection problem in SQL Server 2000 Applicable Important: This article contains information about modifying the registry. Before modifying the registry, you must back up the registry and know how to restore the Registry in case of

10 configuration items that must be adjusted for newly installed MySQL and 10 configuration items for mysql I am still worried about the newly installed mysql service. I don't know which default configurations to modify? Mysql has more than 100

HTTP status information, http €? /A> € €? /A> http € € 1. 1xx message This type of Status Code indicates that the request has been accepted and must be processed. 100 Continue The client should continue sending the request. This temporary response

Apache checks whether a module is effectiveGuideIn this article, we will briefly discuss the Apache server front-end and how to list or view the Enabled Apache modules.Apache is built based on the modular concept. This allows the web administrator

Use the TCP package in Linux to enhance network service securityGuideIn this article, we will describe what is the TCP package (TCP wrappers) and how to configure them on a Linux server to restrict the permissions of network services. Before

Install GridEngineServer on CentOS GridEngine can automatically place tasks on servers with low loads. The latest software package can be downloaded here CentOS is recommended for the server. If ubuntu does not have a GUI. After downloading the

From entering the URL in the browser to loading the page, the url page The general meaning is: if there is a cache, it will be displayed directly. Otherwise, find the IP address on the local machine, find the IP address through DNS, and return it to

Deploy the log server with rsyslog in Linux & record history and send it to rsyslog server, linuxrsyslog1. syslog service Introduction Rsyslog is a multi-thread enhanced version of syslogd. Rsyslog is responsible for writing logs, logrotate is

Recently, I found that the connection to the database in the new column is very slow. I log on to the MySQL database. Mysql> show processlist; | 20681949 | unauthenticated user | 10.10.4.193: 52497 | NULL | Connect | Reading from net | NULL | | 20

MySQL connection is slow. Problem: Recently, the IP address is changed because the server has changed the network segment. After the change, the MySQL client is used to connect to the MySQL server and open the table on the client is very slow

1 domain name resolution (DNS Lookup ):There is nothing to say about the time it takes to resolve the domain name to the server with the specified IP address. 2. Create a connection ):The time required to create a Tcp connection to the server or