---
name: "rlm_acct_unique"
section: "5"
platform: "linux"
package: "freeradius-common"
version: "2.2.5+dfsg-0.2+deb8u1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/rlm_acct_unique"
---

# rlm\_acct\_unique(5)

FreeRADIUS Module

## NAME

rlm\_acct\_unique - FreeRADIUS Module

## DESCRIPTION

The *rlm\_acct\_unique* module creates a unique accounting session Id.

Many NAS vendors have their equipment supply an Acct-Session-Id attribute which is not unique over reboots.  This makes accounting difficult, as there will be many independent sessions with the same Acct-Session-Id attribute.  This module uses the Acct-Session-Id attribute, along with other attributes in the request, to create a more unique session ID, called Acct-Unique-Session-Id.

The main configuration items to be aware of are:

- key

  A list of the attributes used in calculating an MD5 hash which is used as the value for the unique session id.

## CONFIGURATION

```

modules {
  ...
  acct_unique {
	key = "User-Name, Acct-Session-Id, NAS-IP-Address, NAS-Port"
  }
  ...
}
 ...
preacct {
  ...
  acct_unique
  ...
}
```

After generating the MD5 hash, the module adds it to the accounting request packet received from the client.  It will look something like this in your detail file:

```

	Acct-Unique-Session-Id = "c66ef57e480b9d26"
```

NOTE:  Any attribute you specify that is not found in the 'dictionary'  file will cause the server to fail and exit with an error.

NOTE:  If you want the Acct-Unique-Session-Id of the Start and the Stop packet of a particular session to match, you must use values for the key that will stay the same for the Start and Stop.  The above  example is a good start.  Adding 'Acct-Session-Time', for example, would  cause a mismatch because that value is not the same on the Start and  Stop accounting packets.

## SECTIONS

**authorization,** **pre-accounting,** **accounting**

## FILES

*/etc/raddb/radiusd.conf*

## SEE ALSO

[**radiusd**(8)](/radiusd/8.md), [**radiusd.conf**(5)](/radiusd.conf/5.md)

## AUTHORS

Chris Parker, cparker@segv.org