Port 1701

Q: What is port 1701?

L2TP VPN tunneling protocol, typically combined with IPsec UDP port 1701 is used by L2TP (Layer 2 Tunneling Protocol). L2TP itself provides no encryption and must always be paired with IPsec (L2TP/IPsec) for a secure VPN. It is built into Windows, macOS, iOS, and Android as a native VPN option. While secure when properly configured with IPsec, it has reportedly been cracked by the NSA when using pre-shared keys with weak configurations; WireGuard or IKEv2 are preferred for new deployments.

L2TP

L2TP VPN tunneling protocol, typically combined with IPsec

Port

1701

Protocol

UDP

Service

L2TP

Security

Safe

Full name: Layer 2 Tunneling Protocol

What is port 1701?

UDP port 1701 is used by L2TP (Layer 2 Tunneling Protocol). L2TP itself provides no encryption and must always be paired with IPsec (L2TP/IPsec) for a secure VPN. It is built into Windows, macOS, iOS, and Android as a native VPN option. While secure when properly configured with IPsec, it has reportedly been cracked by the NSA when using pre-shared keys with weak configurations; WireGuard or IKEv2 are preferred for new deployments.

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