Several misunderstandings of VPN

VPN Connect the , Still can't open it , Cheated ？

It is estimated that 90% For the first time VPN When , We're going to have this problem . Want to say wall It's bad enough , Think of using DNS Pollution .DNS Pollution （DNS cache poisoning）, Wikipedia has a very detailed description . Simply speaking , It's domestic DNS The server points some domain names that you want to filter to the wrong IP Address , As a result, we cannot open this website when we visit .

therefore , Even if we successfully connect VPN, The encrypted data stream bypasses the filtering system , But we're visiting facebook When , Resolved to a that will never be accessible IP Address , Lead to FB Still can't open it . How to solve it ？ It's simple , Set the default of the currently used network connection DNS Change to foreign public DNS. among , The most well-known honest and reliable young man is Google Provided DNS, such as ：8.8.8.8 8.8.4.4 And then there is OpenDNS Free of charge DNS The server , such as ：208.67.222.222 208.67.220.220

VPN Free traffic is free access to Internet cafes by mobile phones ？

quite a lot VPN Businesses use free traffic as a marketing tool ,200M Traffic 、800M Traffic 、1G Traffic …… In the era of mobile Unicom and telecom jointly extorting traffic , How eager are my friends to have free Internet traffic . Everybody, don't laugh , You must have such a little friend around you .

I looked at you and said ： This is free internet access ？ ah , No ？ Ah, hello , What does free traffic mean ？ That's bullshit ？ vpn It can only be used when the mobile phone can access the Internet ,wifi/2g/3g/4g Fine , The premise is that your mobile phone must be able to access the Internet . vpn Free traffic , It refers to the connection vpn in the future , adopt vpn Network generated traffic . vpn And mobile Internet traffic are calculated at the same time , In other words , adopt vpn Used 100M Traffic , So your mobile phone also consumes the Internet 100M Traffic .

The smaller the response time , The faster the speed. ？

response time （ping value ） The smaller it is , Indeed, the faster , Fast here means fast reaction time , More specifically, the game delay will be much smaller ,Ping The smaller the value. , The game will not delay 、 No card , I believe many game players understand this . however , For the Internet 、 Watch the video and say ,Ping Small value , There is no special advantage .

For example, Hong Kong vpn line ,ping The value is generally in 50 following , However, due to the high price of bandwidth in Hong Kong , Generally, the bandwidth is very small , Watching video is not fast , It's good to receive emails . And the U.S. vpn Often ping Values in 200~300ms above , see youtube Same brush , Meidi has sufficient bandwidth resources on the high , At least all 100M, A lot of is 1G The bandwidth of the . therefore , Watching video is more important than network bandwidth , Your local network bandwidth and vpn Bandwidth of the server .

VPN Namely PPTP,PPTP The fastest ？

VPN It's a concept ,PPTP It's the realization of VPN A way of , except PPTP outside , also L2TP、Cisco IPSec、OpenVPN、IKev2 And so on VPN How to implement . Many people think that PPTP The fastest , exactly PPTP It is the fastest in connection speed , The connection waiting time is the shortest . And then the specific use speed after connecting , Almost no difference .

Although the theoretical discussion is slightly different , But most of us are not aware of it , Completely negligible . therefore , Never mind VPN In what way , Being able to connect is the king's way .