radiusd

TLDR

Start RADIUS server

$ radiusd

Start in debug mode

$ radiusd -X

Check configuration

$ radiusd -C

Foreground with debug

$ radiusd -f -X

Specific config file

$ radiusd -d [/etc/raddb]

DESCRIPTION

radiusd is the FreeRADIUS server daemon. RADIUS (Remote Authentication Dial-In User Service) provides centralized authentication, authorization, and accounting for network access.

PARAMETERS

-X

Debug mode (verbose output).

-C

Check configuration only.

-f

Run in foreground.

-d dir

Configuration directory.

-n name

Server name.

-l file

Log file.

$ # Start daemon
radiusd

# Debug mode (very verbose)
radiusd -X

# Check config syntax
radiusd -C

# Foreground for systemd
radiusd -f

# Test authentication
radtest user password localhost 0 testing123

CONFIGURATION

$ # Main directories
/etc/raddb/              # or /etc/freeradius/
/etc/raddb/radiusd.conf  # Main config
/etc/raddb/clients.conf  # RADIUS clients
/etc/raddb/users         # User definitions

PORTS

$ 1812 - Authentication
1813 - Accounting

CAVEATS

Complex configuration. Requires careful security setup. Debug mode outputs secrets - use only for testing.

HISTORY

FreeRADIUS is the most widely deployed RADIUS server, started in 1999 by Alan DeKok and Miquel van Smoorenburg.