Port 1701
l2f and l2tp · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | l2f and l2tp |
Frequently asked questions
What is port 1701 used for?
Port 1701 is registered with the IANA for l2f and l2tp (TCP/UDP). Description: l2f; l2tp.
Is port 1701 a well-known port?
No. Port 1701 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 1701 is open?
Locally on Linux with ss -tulpn | grep ':1701\b', on Windows with netstat -ano | findstr :1701. To test a remote host use Test-NetConnection <host> -Port 1701 in PowerShell or nc -zv <host> 1701 on Linux/macOS.
How do I open port 1701 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 1701/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1701/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1701" -Direction Inbound -Protocol TCP -LocalPort 1701 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | l2f | l2f |
| UDP | l2f | l2f |
| TCP | l2tp | l2tp |
| UDP | l2tp | l2tp |