Hellow Monfils, OpenVPN is the most preferred protocol and I would recommend you the same. It has a 256-bit encryption that lets you browse the internet safely. It gives you fastest VPN speed across great distances. If you’re happy with a basic encryption and wants a fast VPN speed, then I would recommend PPTP protocol. If OpenVPN isn’t support by your device, then you should prefer PPTP.

Since we all know the great benefits attached to VPN technology, it is also imperative to understand why our internet speed throttles when we connect to a VPN. A VPN is designed with consideration to protect our identity from hackers and allow us to access the geo-restricted content on the web. To do this, it adds highly encrypted protocols and other security mechanisms to make the technology efficient, and a right fit for netizens.
Instead of logically tying the endpoint of the network tunnel to the physical IP address, each tunnel is bound to a permanently associated IP address at the device. The mobile VPN software handles the necessary network-authentication and maintains the network sessions in a manner transparent to the application and to the user.[30] The Host Identity Protocol (HIP), under study by the Internet Engineering Task Force, is designed[by whom?] to support mobility of hosts by separating the role of IP addresses for host identification from their locator functionality in an IP network. With HIP a mobile host maintains its logical connections established via the host identity identifier while associating with different IP addresses when roaming between access networks.
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CHAP is an improvement over PAP because the clear-text password is not sent over the link. Instead, the password is used to create a hash from the original challenge. The server knows the client’s clear-text password and can, therefore, replicate the operation and compare the result to the password sent in the client’s response. CHAP protects against replay attacks by using an arbitrary challenge string for each authentication attempt. CHAP protects against remote-client impersonation by unpredictably sending repeated challenges to the remote client throughout the duration of the connection.

Early data networks allowed VPN-style remote connections through dial-up modem or through leased line connections utilizing Frame Relay and Asynchronous Transfer Mode (ATM) virtual circuits, provided through networks owned and operated by telecommunication carriers. These networks are not considered true VPNs because they passively secure the data being transmitted by the creation of logical data streams.[3] They have been replaced by VPNs based on IP and IP/Multi-protocol Label Switching (MPLS) Networks, due to significant cost-reductions and increased bandwidth[4] provided by new technologies such as digital subscriber line (DSL)[5] and fiber-optic networks.

IPSec NAT-T enables IPSec peers to negotiate and communicate when they are behind a NAT. To use IPSec NAT-T, both the remote access VPN client and the remote access VPN server must support IPSec NAT-T. IPSec NAT-T is supported by the Windows Server 2003 Microsoft L2TP/IPSec VPN Client and by the L2TP/IPSec NAT-T Update for Windows XP and the L2TP/IPSec NAT-T Update for Windows 2000. During the IPSec negotiation process, IPSec NAT-T-capable peers automatically determine whether both the initiating IPSec peer (typically a client computer) and responding IPSec peer (typically a server) can perform IPSec NAT-T. In addition, IPSec NAT-T-capable peers automatically determine if there are any NATs in the path between them. If both of these conditions are true, the peers automatically use IPSec NAT-T to send IPSec-protected traffic.
When you activate a VPN, your web traffic is routed from your computer, through an encrypted tunnel, and to a server controlled by the VPN company. From there, your data exits and enters the public internet. These extra steps generally degrade your internet connection speeds, simply by adding more fiber, more computers, and more physical distance to the equation. In exchange, using a VPN helps protect your data and personal security.
Supported Client Software Android, Chrome, Firefox, iOS, Linux, macOS, Windows Android, Chrome, iOS, Linux, macOS, Windows Android, Chrome, iOS, macOS, Opera, Windows Android, iOS, Linux, macOS, Windows Android, ChromeOS, iOS, Linux, macOS, Windows Android, iOS, Linux, macOS, Windows Android, iOS, macOS, Windows Android, iOS, macOS, Windows Android, Chrome, Firefox, iOS, Linux, macOS, Windows Android, iOS, macOS, Windows