PPTP can be easily blocked by restricting the GRE protocol. IKEv2 uses UDP 500 for the initial key exchange, protocol 50 for the IPSEC encrypted data (ESP) and UDP 4500 for NAT traversal. IKEv2 is easier to block than OpenVPN due to its reliance on fixed protocols and ports. Best VPN Ikev2 and PPTP provider
PPTP is the most commonly used protocol as it offers the greatest security features and ease of configuration. In order to make a connection using PPTP, the user will typically connect to the VPN via their Internet Service Provider (ISP). Because of this, PPTP connections will not be able to access websites that use encryption methods such as SSH or VPN. However, it does provide the user with a much increased benefit compared to other open source VPN protocols such as OpenVPN or L2TP/IPsec as it allows them to bypass geo-restrictions and
then as well as provide an anonymity when using public Wi-Fi networks.
SSTP is based on IANA / QST
This protocol is not commonly used
PPTP and L2TP/IPsec are widely used for VPN services. PPTP is a version of OpenVPN that was developed by the Open VPN Project. It can be used to establish a secure connection between two locations on different network segments, allowing users to hide their true IP address. L2TP/IPsec is an extended public-key infrastructure (PKI) that provides encryption and authentication services over common Internet protocols such as TCP/IP and UDP. This allows end users to send data through a VPN service without exposing their true IP address, even if their device transmits traffic onto the Internet through an outbound network or some other method that reveals its location to applications that are operating on the applications layer.
PPTP and IKEv2 are the most widely used VPN protocols. These protocols allow data to pass from your computer to another computer unblocked, allowing you to hide your true IP address. Several popular commercial VPN services use these protocols to hide their users’ locations from websites that use network topology information to display the location of your computer to visitors. By default, Windows allows users to bypass Internet security features provided by software like P2P VPNs by default, unless the user specifically enables security software from third party providers.
The predilection for PPTP, and its associated plugins is now so common that it is no longer considered an exploit; it is a feature. Nearly all ISPs have Cisco IOS software that is vulnerable to remote exploit, at least on some versions of Cisco IOS. The Cisco IOS vulnerability is so serious that it has been used by criminal groups to deliberate network attacks.
PPTP has been proven to be more vulnerable to attacks than OpenVPN or L2TP/IPsec and more resilient to disturbances in network connectivity. That’s because it relies on a private keyio shared between the client and server to authenticate and negotiate layers. If ancillary equipment or applications are cloned on one side of the VPN connection, the activity can be replayed on the other side without the user’s knowledge. It is possible to detect if a VPN is PPTP by observing the difference in ARP broadcast behavior. One way to evaluate protocols is to compare the broadcast behavior of two different applications and notice if they behave differently (i.e., advertise different information when querying for IP addresses).
PPTP VPN is a protocol used to access the internet via a private network.PPTP is also sometimes called Personal Secure Virtual Private Network (VPN), OpenVPN, L2TP/IPsec, or TorVPN.PPTP VPN uses software proprietary to PPTP provider to create tunnels and creates public/private key pairs using public-key cryptography to maintain end-to-end encryption between client and server. PPTP can be used to securely connect to the internet through almost any device that supports the OpenVPN protocol.
PPTP VPN was developed as an end-to-end tunneling protocol intended to improve digital security and privacy by providing transparent and untrusted tunneling between devices. OpenVPN is an open standard VPN system that allows devices to create tunneled connections to each other over public networks. Whereas P2P communication allows instant end-to-end encryption, standard VPNs rely on public key cryptography which can be passively observed by ISPs and law enforcement agencies.