What is a VPN?

A VPN, or virtual private network, is a secure tunnel between your device and the internet. VPNs protect you from online snooping, interference, and censorship.

Benefits and advantages of VPN
Change your location

Using a VPN changes your IP address, the unique number that identifies you and your location in the world. With a new IP address, you can browse the internet as if you were in the UK, Germany, Canada, Japan, or virtually any country, if the VPN service has servers there.

Protect your privacy

Changing your IP address with a VPN helps hide your identity from websites, apps, and services that want to track you. Good VPNs also hide your activity from your internet provider, mobile carrier, and anyone else who may be listening, thanks to a layer of strong encryption.

Increase your security

Using a VPN protects you from hacking in many forms, including packet sniffing, rogue Wi-Fi networks, and man-in-the-middle attacks. Travelers, remote workers, and all kinds of on-the-go individuals use a VPN whenever theyre on an untrusted network like free public Wi-Fi.

Unblock websites

If youre in a part of the world that restricts access to Google,Wikipedia, YouTube, or other sites and services, using a VPN will let you regain access to the free internet. You can also use a VPN to break through firewalls on school or office networks.

When should I use a VPN?
If privacy is important to you, you should use a VPN every time you connect to the internet. A VPN app runs in the background of your device so it wont get in the way while you use other apps, stream content, and browse the internet. And youll have peace of mind knowing your privacy is always protected.
But here are some situations in which a VPN is especially useful:
While traveling

Exploring the world doesnt mean you have to change the way you use the internet. A VPN lets you use the internet as if you were still in your home country, no matter how far you travel.

While streaming

Using a VPN lets you watch movies and TV on streaming services like Netflix, Hulu, Amazon, and HBO with freedom from ISP throttling or blocking by your ISP or local Wi-Fi network.

While on public Wi-Fi

Public Wi-Fi hotspots like those in cafes, airports, and parks are common hunting grounds for cybercriminals. Using a VPN on your devices stops hackers in their tracks.

While gaming

Using a VPN unlocks games, maps, skins, and other add-ons that might be restricted on your network. It also shields you from DDoS attacks and reduces ping and overall lag.

While torrenting

P2P file sharing usually means that strangers can see your IP address and possibly track your downloads. A VPN hides your IP address, letting you torrent safely and anonymously.

While shopping

Some online stores show different prices to people in different countries. With a VPN, you can find the best deals in the world no matter where youre shopping from.

How does a VPN work?
A VPN is a private network that uses a public network (usually the Internet) to connect remote sites or users together. Unlike using actual dedicated connections (such as leased lines), VPNs use virtual connections routed through the Internet to connect the companys private network with remote sites or employees.
Here are several key concepts related to VPN that will help you understand how a VPN works and the benefits it provides:

The firewall provides a strong barrier between the private network and the Internet. You can set up a firewall to limit the number of open ports and the types and protocols of packets allowed to pass through the firewall.


The Internet Protocol Security Protocol (IPSec) provides enhanced security features, such as better encryption algorithms and more comprehensive authentication.

Tunnel technology

Tunneling technology is the process of putting the entire data packet into another data packet and sending the latter out over the network. The entry point and exit point of the network and data packets entering and exiting the network (we call the tunnel interface) can understand the protocol of the external data packet.

AAA server

AAA server (authentication, authorization and accounting) is used to achieve more secure access in remote access VPN environment. When the dial-up client's request to establish a session comes in, the request will be sent to the AAA server by the proxy. Then, the AAA server will check the following:who are you,What you can do,What did you actually do.

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