Which VPN Protocol Uses UDP Port 1701?

If you’re wondering which VPN protocol uses UDP port 1701, the answer is L2TP. L2TP is a tunneling protocol that’s often used with IPSec for added security.

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While most VPN protocols use TCP to transport data, there are a few that use UDP instead. One such protocol is L2TP/IPsec, which is often used in conjunction with PPTP. L2TP/IPsec uses UDP Port 1701 for its data transport, which makes it a good choice for use with a VPN.

The Different Types of VPN Protocols

A VPN, or Virtual Private Network, is a way to securely connect to a private network over the internet. There are a few different types of VPN protocols, and each has its own advantages and disadvantages. In this article, we’ll be discussing the UDP port 1701 VPN protocol.

Internet Protocol Security (IPSec)

Internet Protocol Security (IPSec) is a protocol suite that authenticates and encrypts the packets of data sent over an internet protocol network. It is commonly used in virtual private networks (VPNs) to protect traffic as it traverses public networks, such as the Internet.

IPSec uses two main protocols for authenticity and encryption: the Internet Security Association and Key Management Protocol (ISAKMP) and the IPSec Encapsulating Security Payload (ESP). ISAKMP defines methods for key exchange and authentication, while ESP defines mechanisms for encryption and data integrity.

IPSec can be deployed in either transport mode or tunneling mode. In transport mode, IPSec protects individual application traffic flows. In tunneling mode, IPSec encapsulates entire-IP payloads, providing protection for all traffic between two IPSec-enabled devices.

IPSec is often used in conjunction with other security protocols, such as Transport Layer Security (TLS) or Secure Sockets Layer (SSL), to provide a higher level of security for Internet communications.

Layer 2 Tunneling Protocol (L2TP)

Layer 2 Tunneling Protocol (L2TP) is a combination of PPTP and L2F designed by Microsoft and Cisco. It is an extension of the PPP protocol used for dial-up connections. L2TP uses UDP port 1701.Like PPTP, it encapsulates PPP frames in IP datagrams for transmission over the network. However, unlike PPTP, L2F supports any type of encapsulation method that can be used with PPP frames.

L2TP provides confidentiality, integrity, and authentication by using IPSec to protect data at the packet level. The combination of these three features is sometimes referred to as “SIPSec”.

Point-to-Point Tunneling Protocol (PPTP)

Point-to-Point Tunneling Protocol (PPTP) is a method for implementing virtual private networks. PPTP uses a control channel over an IP network (the Internet) to provide secure point-to-point connectivity. A PPTP tunnel is implemented when two or more PPTP enabled clients agree to connect to each other over an IP network. A PPTP tunnel passes through intervening networks without being exposed at any point (hence the term “tunneling”).

PPTP uses the Generic Routing Encapsulation (GRE) protocol to encapsulate PPP packets for transport over IP networks. GRE is a standard protocol that is often used by ISPs to enable the transport of data over their network. GRE is not encrypted and so it can be used to transport PPTP traffic without any encryption. However, most implementations of PPTP use Microsoft Point-to-Point Encryption (MPPE) for encryption of the data stream. MPPE uses the RC4 stream cipher and is considered very good at providing confidentiality of data streams.

Secure Socket Tunneling Protocol (SSTP)

Secure Socket Tunneling Protocol (SSTP) is a PPP over SSL VPN protocol. SSTP uses the HTTPS protocol over TCP port 443 to establish a connection. In most firewalls, HTTPS traffic is allowed, making this an ideal choice for a VPN protocol. SSTP uses compression, encryption, and integrity checks to secure the data that is sent over the tunnel.

SSTP was introduced in Windows Vista Service Pack 1 and Windows Server 2008. It is also supported in Windows 7, Windows 8, Windows 8.1, and Windows 10.


OpenVPN is an SSL/TLS VPN solution. It is the most popular VPN protocol and is used by a majority of VPN providers. OpenVPN uses UDP port 1194 by default. OpenVPN traffic is encrypted with AES-256-CBC with a 2048-bit key.


Based on our findings, we can conclude that UDP port 1701 is mostly used by the L2TP VPN protocol. However, this doesn’t mean that other protocols don’t use this port.

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