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RADIUS Dictionary File

The RADIUS Dictionary File (radius.txt) is a text file which defines the RADIUS attributes used in Evolynx RADIUS Server. This file is loaded and parsed by the server application at start-up and if a change is made to contents of this file, Evolynx server must be re-started for changes to effect.

File Format

Dictionary file is a text file. Each line of text is parsed separately than other lines. It means that a command can not be broken into more than one line. TAB and space characters can be used as separators between parameters of each command. If a line starts with “ -” character, that line will be ignored. This feature can be used for placing remarks and descriptions in the file. Each line of dictionary file defines one entry using a command. Currently there are 2 different types of dictionary entries:



If a line is started with ATTRIBUTE command, that line will be parsed as a normal RADIUS attribute. Format of an ATTRIBUTE command is:

ATTRIBUTE name code type <nowiki>[Used_in ...]</nowiki>

This is a string of characters used as a name for the attribute. Name is NOT case-sensitive. Space and TAB characters are not permitted in a name. Name must be unique.


Code is an integer number normally in the range of 1-191. This is the Attribute code defined in RADIUS RFCs.


This parameter specifies how Evolynx RADIUS will interpret the value of this attribute. There are 4 different types defined in Evolynx RADIUS server:

  • string
  • integer
  • octets
  • ipaddr
Used_in ...

These parameters are up to 6 values of 0 or 1. Each of these values determines if this attribute is used in any of following six primary RADIUS packet types respectively:

  • Access Request
  • Access Accept
  • Access Reject
  • Access Challenge
  • Accounting Request
  • Accounting Ack

Example: User-Name attribute is used in Access Request, Access Accept and Accounting Request packets, so we need to put “1” in positions 1, 2 and 5, as follows:

1 1 0 0 1 0

Evolynx RADIUS server uses these values when creating RADIUS packets (either to send to a client device or to forward to a remote server). For example, if a value of 1 exists for Access Accept (second position), then this attribute will be included in the outgoing packet (Only if it has a value).


If a line is started with VENDORATTR command, that line will be parsed as a Vendor Specific Attribute (VSA). Format of an VENDORATTR command is:

ATTRIBUTE vendorID name code type <nowiki>[Used_in ...]</nowiki>

Specifies the Vendor. For example 311 is for Microsoft and 9 is for Cisco.


Code is an integer number specifying this VSA. This code is defined by each vendor. (All other parameters are as described for ATTRIBUTE command.)


  • Do not modify this file (radius.txt) unless you are an expert in configuring RADIUS attributes.
  • Always use standard names for attributes, because some of the attribute names are hard-coded inside the program.
  • If you define a new attribute in dictionary file and mark it to be included in out-going packets, it does not guarantee that it will be included in that packet. It will be included in an out-going packet only if it has a value. An Attribute will be included in out-going packets only if:
    • It receives a value from an in-coming packet.
    • Hard coded logic inside Evolynx RADIUS server creates it.
    • A developer creates a code using Evolynx API to create that attributes.
radius_dictionary_file.txt · Last modified: 2023/08/14 06:41 (external edit)