Port 1701 — L2TP

UDP · Port 1701/UDP is used for Layer 2 Tunneling Protocol (L2TP) over UDP, a VPN protocol that encapsulates PPP frames. L2TP provides secure and reliable data transmission between two endpoints. This port/service is relevant to network security as it enables remote access and site-to-site VPN connections.

Port Number: 1701
Service Name: L2TP
Protocol: UDP
Common Software: xl2tpd, strongSwan

Security Notes

Review IANA registry for port 1701 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 1701 used for?

Port 1701 is used for L2TP. Port 1701/UDP is used for Layer 2 Tunneling Protocol (L2TP) over UDP, a VPN protocol that encapsulates PPP frames. L2TP provides secure and reliable data transmission between two endpoints. This port/service is relevant to network security as it enables remote access and site-to-site VPN connections. Common software: xl2tpd, strongSwan.

Is port 1701 dangerous to leave open?

Review IANA registry for port 1701 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 1701 is open?

Use nmap: nmap -p 1701 <target> or check locally: ss -tlnp | rg 1701