dns cache poisoning

Some time ago, I changed the server to using ipfilter + ipnat + dhcp -- ipfilter + ipnat packet filtering, forwarding, and DHCP server architecture notes under freebsd5.4. However, I recently felt that the server is always offline, I opened another dns Cache service on the server, hoping to alleviate the current situation through caching. First, we will introduce how to create a high-speed

Tutorial Background:The company's current network environment is accessible to all users above the internet, and the DNS used is obtained through the DHCP server, the DNS address entered on the DHCP server is a registered DNS server on the Internet. But ainuo did not set up a DNS server. With the increase of business,

How to empty the DNS cache method/Command How to empty the DNS cache under Microsoft Windows In Microsoft Windows, your can use the command Ipconfig/flushdns to flush the DNS resolver cache. Under Microsoft Windows, you can use

Problem Description: When you right-click Local Area connection to select Repair, you are prompted that Windows cannot complete the fix problem because the following actions cannot complete the cleanup of the DNS cache ... "error, as shown in the following figure; 　　To clear the DNS cache, the solution for the

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 services, hoping to mitigate the current situation through caching.First describes how to set up a high-speed DNS cache server on FreeBSD, citing the words in the Fr

How to view the contents of the DNS cache, in fact, is simply a command prompt. The steps are as follows: (1) Run the command prompt as an administrator. Attention (2) at the command prompt, type Ipconfig/displaydns. Then it pops up a whole bunch of stuff. Take a look at me for a long, long time. View the internal pride of the DNS

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 the local DNS resolution cache, and the domain name or the server has b

In Linux, cache DNS resolution is used to speed up the response to the Internet-Linux Enterprise Application-Linux server application information. The following is a detailed description. When you use Firefox to browse a webpage, you will always see a prompt in the lower left corner at the beginning: "Parsing host xxx ..." It seems that the DNS server is waitin

These days I have been very careful and found that when I browsed the web page using Firefox, I always saw a prompt in the lower left corner at the beginning: "Parsing host xxx ..." It seems that it is waiting for the DNS server to resolve the domain name. It is idle, so I decided to make a DNS Cache to speed up the Internet! I found a software that meets the r

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 each request for data in the remote URL will be re-made to the DNS query

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 "Ipconfig/flushdns" is executed, the local

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 effect or exceptions. We can resolve this situation by manually clearing the DNS