Port 1997
gdp-port · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | gdp-port |
Frequently asked questions
What is port 1997 used for?
Port 1997 is registered with the IANA for gdp-port (TCP/UDP). Description: cisco Gateway Discovery Protocol.
Is port 1997 a well-known port?
No. Port 1997 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 1997 is open?
Locally on Linux with ss -tulpn | grep ':1997\b', on Windows with netstat -ano | findstr :1997. To test a remote host use Test-NetConnection <host> -Port 1997 in PowerShell or nc -zv <host> 1997 on Linux/macOS.
How do I open port 1997 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 1997/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1997/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1997" -Direction Inbound -Protocol TCP -LocalPort 1997 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | gdp-port | cisco Gateway Discovery Protocol |
| UDP | gdp-port | cisco Gateway Discovery Protocol |