what is dns cache

I often ask if domain name resolution does not take effect immediately. Why is it still the original one? The answer is that there is a resolution cache in the local DNS. After the computer first accesses it, it will be cached within a certain

How do some users encounter a failure problem when the Windows7 system refreshes the DNS cache? After changing the Win7 system DNS address, we need to flush the DNS cache in order for the new DNS to take effect quickly, although some users are using

First describes how to establish a high-speed DNS cache server on FreeBSD, citing the words in the Freebs D Chinese Manual: A cached domain name server is a domain name server that does not provide authoritative resolution for any domain. It simply

The server was replaced by a previous arrayipfilter+ipnat+dhcp--freebsd5.4UnderIpfilter+ipnatPacket filtering, forwarding, andDhcpServer Schema Notes, but recently felt that the server will often drop the line, on the server to open aDnsCaching

Many people may encounter this situation, sometimes visited the site is now suddenly unable to find the server, this is why? This is the impact of the DNS cache, because after the first visit to the Web site will have a certain amount of time after

Use "WIN +r" shortcut to open the Run window, enter "CMD" command, the command Line window.In the Command Line window, enter "Ipconfig/flushdns" to refresh the local DNS cache data.If the error "DNS resolution cache cannot be refreshed" appears when

The other side, the flowers are not open * DNS Server Detection Method:This article focuses on the BIND server. The following experiment targets BIND9 service installed on Solaris10 (Version: 9.2.4 ).The BIND server can detect exceptions in two ways:

The DNS Cache vulnerability is a security system that is vulnerable to the Internet in our applications. The root cause of poor security lies in design defects. By exploiting this vulnerability, users may not be able to open the webpage. The most

Sometimes when we use a computer, we find that the network suddenly becomes slow, and we may clean up the DNS cache, but we find that the DNS cache is not clean, so what if your computer is a Win7 system and cannot clear the DNS cache? Do not

Command for refreshing DNS cache in CentOS To refresh the DNS cache, You need to restart the nscd daemon: 1. to restart nscd daemon, enter/etc/rc in the command line window (terminal. d/init. d/nscd restart2. after the command is executed, your

Domain Cache detection (DNS cache snooping) technologyIn a corporate network, DNS servers are typically configured to provide domain name resolution services for hosts within the network. These DNS not only resolves their own private domain name,

Most DNS cache servers exist in small enterprises. they are not responsible for domain name resolution and are only used to help users query domain name information from other DNS servers. The queried information is saved locally to facilitate the

This is a problem that bothers me for a long time. I developed front-end code under the Mac, and since HTML5 development became the focus of work, Chrome has gradually replaced Firefox as the preferred browser.As a front-end dever, switching the

Just a few weeks after Twitter was hacked, Baidu was attacked by the Iran organization named "Iranian cyber army". For more information, see the following link:   Http://thenextweb.com/asia/2010/01/12/breaking-baidu-hacked-iranian/

When Curlopt_dns_use_global_cache is enabled, a global DNS cache is enabled, which is thread-safe and enabled by default.Curlopt_dns_cache_timeout sets the time to save DNS information in memory by default of 120 seconds.1) fopen/file_get_contents

Usually we can not open the page through the domain name, it is possible to cause the DNS cache (DNS resolved IP address changed), the workaround is as follows:Method One: $nslookup ecafe.pub (here is the domain you want to open)Method Two:

OverviewThe ARP command is used to manage and view the kernel IPv4 network ARP cache. It can be used to add and delete records to the cache table. ARP is an abbreviation for Address Resolution Protocol (Resolution Protocol) to find the MAC address

The first time to send a bo, or to commemorate a painful experience it.Because of the relocation of the machine room, it involves a company-wide use of the DNS Cache service, because the full trust of the Linux system, so the machine is not more

DNS, a distributed database, makes it easier for users to access the Internet. In the Win7 system, we often set up DNS to speed up the network. But sometimes we have access to some of the Web site exception, but also because the DNS does not take

This article illustrates the Java implementation method to clean up DNS cache. Share to everyone for your reference. The specific analysis is as follows: First, test environment Os:windows7 x64 Jdk:1.6.0_45 Second, I found four ways to clean up