RADIUS
Remote Authentication Dial-In User Service
Application Layer — Security & VPN
Protocol Overview
Full Name
Remote Authentication Dial-In User Service
Abbreviation
RADIUS
OSI Layer
Application Layer
Category
Security & VPN
Default Port
1812, 1813
RFC
RFC 2865
About RADIUS
AAA protocol (Authentication, Authorization, Accounting) for network access. Widely used for Wi-Fi, VPN, and ISP authentication.
Application Layer
Security & VPN
Port 1812, 1813
Standards Reference
RADIUS is defined in RFC 2865, published by the Internet Engineering Task Force (IETF). RFCs are the official standards documents for internet protocols and are freely available for public review.