If you’re wondering which VPN protocol uses UDP port 1701, the answer is L2TP/IPSec. This is a popular protocol for VPNs, and it’s used by many different providers.
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Introduction
VPN protocols are the methods by which your device connects to a VPN server. The most common VPN protocols are L2TP, PPTP, SSTP, and IKEv2.
L2TP uses UDP port 1701
PPTP uses GRE (protocol 47)
SSTP uses TCP port 443
IKEv2 uses UDP port 500
VPN Protocols
L2TP/IPsec
L2TP/IPsec (Layer 2 Tunneling Protocol with Internet Protocol Security): L2TP is not secure on its own, so it’s generally paired with the IPsec secure-networking standard. The combination of the two was once thought to be very secure when properly implemented, but some VPN services suggest that you use OpenVPN instead. L2TP/IPsec has native support in Windows, OS X/macOS, Android, Chrome OS and iOS. Most VPN services support it.
Pros: Though L2TP alone is not especially secure, most implementations of it are; Cons: Requires IPsec security protocol to be implemented in a compatible way by both client and server
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) and requires the establishment of a Point-to-Point Protocol (PPP) connection between the PPTP client and the PPTP server. Data is then passed through this tunnel.
Passive Mode DNS Resolution
UDP port 1701 is used when establishing a VPN connection using PPTP in passive mode. Inactive clients will typically have their firewall forward this port to the active client so that it can be used when needed.
SSTP
SSTP is a Microsoft protocol that uses SSL to provide a VPN tunnel. It’s a more modern option that uses the same port as HTTPS (443), so it can pass through most firewalls without any configuration changes. It’s also one of the most secure protocols because it uses SSL, which is the same protocol that’s used to encrypt web traffic.
IKEv2
IKEv2 is a VPN protocol that uses UDP port 1701. It is commonly used for site-to-site VPNs.
OpenVPN
OpenVPN uses a custom security protocol that relies heavily on OpenSSL, similar to the SSL encryption used on websites. OpenVPN encrypts data with either a 128-bit or 256-bit cipher, making it one of the most secure VPNs today. You can choose between different protocols offered by OpenVPN, such as UDP or TCP. Each has its own advantages, but we recommend UDP for most purposes.
Conclusion
In conclusion, the VPN protocol that uses UDP port 1701 is L2TP/IPSec. This protocol is commonly used by VPN providers to offer a secure and reliable connection. If you are looking for a VPN provider that offers this protocol, make sure to check out our list of the best L2TP/IPSec VPN providers.