Thanks for the invitation! I think changing the DNS to 114. 114. 114. 114 may not only help your internet speed increase, but may affect your broadband internet speed.
Where is the bandwidth bottleneck of the home broadband network?
The most fundamental basis for the speed of our home broadband is the operator’s restriction, that is, if we buy 200M bandwidth, no matter how optimized, the maximum bandwidth used will not exceed 200M . Any impact on the network is just to make this bandwidth smaller, unless you buy a larger bandwidth from the operator.
So I understand the meaning of speed-up here, that is, how to achieve the bandwidth allocated to you by the operator as much as possible. To understand how to achieve this, we have to look at the structure of our broadband and see where the bottleneck is.
As shown in the above figure, the broadband access network of the operator generally does not have a bandwidth bottleneck, that is, the network from the optical modem to the broadband server BRAS of the operator, should not become a bandwidth bottleneck, unless your optical modem It's really broken. Then it may have an impact on our bandwidth, that is, the home, or the operation mall domain network upwards.
The bottleneck of home network broadband is most likely in the home router. If the bandwidth of the operator purchased is greater than 200M, our home router is best to choose a dual-gigabit, 4-core router, which will basically not become a bottleneck. I won't go into details here, and interested friends can just read the reviews of other home routers.
If there is no problem with the home network, then the biggest possible broadband bottleneck is in this segment, which is the segment from the backbone network of the operator to the ISP service provider from the BRAS device up . ISP is what we call Internet service providers, such as Taobao, Youku and other companies that provide Internet services.
For example, the bandwidth of the Youku data center is 2T. If only 40,000 users access the Youku server, then everyone has a bandwidth of 50M. If a TV series is popular and 200,000 users access Youku, then everyone can enjoy the bandwidth Only 10M, the bandwidth may be insufficient for some video services at this time, and packet loss will occur.
For another example, many friends feel that certain websites are slow when using mobile broadband. This is because these websites are not directly connected to mobile phones, but directly connected to telecommunications. Therefore, mobile users must go through telecommunications to access these websites, and the bandwidth of telecommunications and mobile intercommunication is limited, such as 100G. So when it’s busy at night, a large number of users visit those websites through the optical fiber that interoperates with mobile and telecommunications. The bandwidth of 100G may be less than 1M per person. Even though the bandwidth of mobile to your family is 100M, you can still only use it. Visit the website with 1M bandwidth, so it can't be opened.
This is the main bandwidth bottleneck of our home broadband. All bandwidth optimizations and speed-ups are basically a fuss in this respect, that is, trying to solve the bandwidth bottleneck problem when users visit ISPs.
Modify DNS, can not enjoy the broadband acceleration function of the operator
So back to this question, can we modify the DNS to optimize our broadband experience and achieve the maximum utilization of the bandwidth allocated by operators? I don’t think it can. Basically it will definitely achieve the opposite effect, that is, it may slow down.
When we get the address online, we use the operator's own DNS, and return the DNS you want to visit through the operator's own DNS. This process is not different from the process of using a third-party DNS, but the only difference is the URL address that the operator's DNS tells you, which may be a special address.
This address is closely related to the operator's network. For example, Youku, the operator may have a video server locally, or the operator may cache Youku's videos. In short, the operator has done a process that allows you to watch Youku faster and does not freeze. At this time, the Youku address returned by the DNS may be The address of the operator’s local video server, or the address of the operator’s Youku video acceleration.
So in this case, if you use the operator’s DNS, it will definitely be faster and better, and it’s harder to get stuck, because the goal of operator network optimization is to either end the traffic locally to avoid cross-networking, or let the traffic go. A faster road to avoid everyone's bloodshed . Operators have basically optimized some mainstream applications, so using the DNS of this network operator definitely has more advantages than disadvantages.
If you use a third-party DNS such as 114.114.114.114, it is very likely that the address returned by the DNS is the address of another operator. For example, if a mobile user returns you the DNS address of Youku Telecom, it will make your network traffic go even more. Congested Internet traffic, in fact, the bandwidth experience is worse
Therefore, we generally do not recommend using a third-party DNS, unless it is a situation, the operator’s DNS is broken, it cannot be used, and the web page cannot be opened. At this time, you can use the third-party DNS to help.