---
name: "radsniff"
section: "8"
platform: "linux"
package: "freeradius"
version: "3.2.10-4"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/radsniff"
---

# radsniff(8)

dump radius protocol

## NAME

radsniff - dump radius protocol

## SYNOPSIS

**radsniff** \[**-c** *count*\] \[**-d** *directory*\] \[**-F**\] \[**-f** *filter*\] \[**-h**\] \[**-i** *interface*\] \[**-I** *filename*\] \[**-m**\] \[**-p** *port*\] \[**-r** *request*filter\] \[**-R** *response*filter*\]* \[**-s** *secret*\] \[**-S**\] \[**-w** *file*\] \[**-x**\]

## DESCRIPTION

**radsniff** is a simple wrapper around libpcap.  It can also print out the contents of RADIUS packets using the FreeRADIUS dictionaries.

## OPTIONS

- \-c *count*

  Number of packets to capture.

- \-d *directory*

  Directory where the dictionaries are found.

- \-F

  Filter PCAP file from stdin to stdout. Output file will contain RADIUS packets.

- \-f *filter*

  PCAP filter. (default is udp port 1812 or 1813)

- \-h

  Print usage help information.

- \-i *interface*

  Interface to capture.

- \-I *filename*

  Read packets from filename.

- \-m

  Print packet headers only, not contents.

- \-p *port*

   Listen for packets on port.

- \-r *attribute-filter*

  RADIUS attribute request filter.

- \-R *attribute-filter*

  RADIUS attribute response filter.

- \-s *secret*

  RADIUS secret.

- \-S

  Sort attributes in the packet. Used to compare server results.

- \-w *file*

  Write output packets to file.

- \-x

  Print out debugging information.

## SEE ALSO

[radiusd(8)](/radiusd/8.md),[pcap(3)](/pcap/3.md)

## AUTHORS

Nicolas Baradakis \<nicolas.baradakis@cegetel.net\>