Curated port reference

Port 1812: RADIUS authentication

RADIUS authentication commonly uses port 1812 over TCP + UDP. Review its purpose, traffic direction and operational security considerations.

1812TCP + UDP

RADIUS authentication

Authentication and authorisation requests for RADIUS clients.

Typical use

Wi-Fi, VPN, switch, firewall, and network-access authentication.

Traffic direction

Client to server

Security considerations

Use strong shared secrets, RadSec where supported, trusted client allow-lists, and protected management networks.

Radius