DNS Jumper - a free utility for quick one click switch of network card DNS address settings (batch speed measurement/cache clearing, etc.)

Due to frequent visits these days network The speed is slow. Occasionally, the website cannot be opened, or the access speed is particularly slow. In addition, the access to some foreign websites is not smooth. After a round of inspection, it was found that it was my local telecom DNS server Frequently commit two offenses, either overload downtime, forced advertising, or fire prevention [Keyword Crab Patch] Interference, etc.~

Try to change a set of DNS servers in the network card settings, and everything will return to normal, Internet speed Hurry! As a result, the Internet now inexplicably slows down or fails to open Webpage , I will try to change a set of DNS settings, which is often solved in this way. But as a lazy person, I always need to set it. It's always a bit uncomfortable to manually input the IP address, so I found a Free green gadget for one click quick DNS switch —— DNS Jumper ！ Well, life is beautiful again

First, what exactly is DNS?

The full name of DNS is Domain Name System or Domain Name Service, which can be explained in plain language. For users who surf the Internet, DNS is a server (or servers) on the network, which is designed to resolve the IP address of the web address for everyone when surfing the Internet. When the Internet was invented, it needed to rely on the IP address to locate the server or network device on the network. It can be seen as the number of a website, but the IP address (such as 124.122.45.2) is too difficult for people to remember. If you need to enter such an address on any website, it may be a nightmare for anyone! As a result, people invented the domain name (website), which is a meaningful combination of words like iPlaySoft.com to help people remember and input.

However, although people can understand domain names, computers only understand IP addresses. What should we do? Well, when you use a computer to access the domain name www.iPlaySoft.com in different dimensions, there must be a "guide" who knows how to "translate" to tell your computer, www.iPlaySoft.com What IP address does it correspond to, so that your computer can know how to find a heterogeneous server and download the content of the web page you want to visit. The role of this "guide" is DNS.

Simple DNS working diagram

Why modify DNS address?

Generally speaking, DNS in China is provided by network operators. For example, if you use China Telecom's network, it will automatically assign you a set of DNS addresses set up by China Telecom itself after you dial up to access the Internet, so you can normally access the Internet without manually setting DNS. But if the DNS server itself fails or is busy, you will fail or slow to access any website. Because your computer can't get the IP address corresponding to the web address from DNS, it naturally doesn't know how to find the website.

In addition, sometimes fire prevention [Keyword Crab Patch] will also be applied to some DNS The server For example, when you try to open google.com, the DNS server will be interfered and return an incorrect IP address or simply intercepted without returning results, which makes it particularly difficult to access Google sometimes. Moreover, some network operators also use DNS to forcibly insert advertisements. It is common that when you visit an incorrect or non-existent domain name, it will turn to a page full of advertisements instead of simple error prompts. Therefore, I suggest that you collect more IP addresses of different DNS servers from local operators, or those provided by third-party companies Public free DNS server To quickly switch to use when DNS is abnormal.

Manually modify DNS settings:

When collect After some standby DNS addresses are available, I usually need to do four things every time I encounter a problem and want to change the DNS settings:

1. From Impression Notes In it, you can find notes recording DNS candidate addresses;
2. Use the Ping command to simply test whether the current DNS speed is fast enough;
3. Open the network card setting window and manually enter the new DNS IP address;
4. Use the command to clear the local DNS cache to make the new DNS take effect quickly;

[Additional tips: What is DNS caching?]
As mentioned above, the function of DNS is that every time you visit a website, it will be converted into an IP address and returned to your computer. But if you visit a website many times in a short time and DNS has to resolve it many times and return it to you, you have repeated your work, right? So the operating system cleverly designed a local "DNS cache". When you visit iPlaySoft.com for the first time and DNS returns the correct IP address, the system will temporarily store this result, which is called DNS cache.

And it will set an expiration time for the cache (for example, N hours). Within N hours, when you visit the website again, the system will directly return the results from your computer's local DNS cache to you, without having to ask the DNS server again, which in a disguised way "speeds up" the resolution of the website. Of course, after N hours, the system will automatically ask the DNS server again for new results.

Therefore, when you modify the DNS server and do not want the computer to continue using the previous DNS cache, you need to manually clear the local cache. The manual method is to enter the command line prompt and enter ipconfig /flushdns And enter.

DNS Jumper - A gadget that allows you to switch DNS address settings with one click:

Well, as a typical lazy person, I obviously don't want to be as troublesome as the above mentioned in modifying DNS addresses and clearing DNS cache. It would be great if there was a tool that allows me to directly select some preset DNS addresses from the list, and can quickly measure speed, one click application and refresh the DNS cache! Mm-hmm. Today's protagonist DNS Jumper It is such a free gadget!

After trial, I found that DNS Jumper It is simply customized for our domestic citizens. It not only has Google Open DNS, Comodo DNS, etc Free public DNS , users can also manually add/delete their collected addresses. More practical is that it can also measure the speed of your DNS list in batches and automatically select the fastest one for application. It can also clear the local DNS cache with one key. Well, it basically meets all my needs!

DNS Jumper Completely free, green installation free, very compact size, tested support Windows 10 , Win7, Vista, XP, supporting 64 bit and 32-bit systems, and supporting separate settings of multiple network cards (such as WIFI Wireless network card and ordinary Ethernet network card), providing multiple languages including simplified Chinese. It is very simple to use. Basically, just look at the figure above, you will already know how to use it. If you also need to change DNS settings like me, then try it! Quite convenient and practical!