Glossary

S

Service

A means of specifying the method to use to perform a function. A service can be specified for the

 

following functions: authentication, authorization, accounting, and authentication-authorization. For

 

example, a service can specify that authentication be performed using the local database, or a service

 

can specify that accounting be supported by logging information to a file.

Services

Session

Three default services are referenced by the server configuration and when processing scripts. They are Default Authentication Service, Default Authorization Service, and Default Accounting Service. Each service has a type and (if it is using remote servers) an ordered list of servers to use.

Each service provided by the NAS to a dial-in user constitutes a session, with the beginning of the session defined as the point where service is first provided and the end of the session defined as the point where service is ended. Depending on NAS support capabilities, a user may have multiple sessions in parallel or in series.

SHA-1

Secure Hash Algorithm; a hashing algorithm that produces a 160-bit digest based upon the input. The

 

algorithm produces SHA passwords that are irreversible or prohibitively expensive to reverse.

Shared Secret

Used to authenticate transactions between the client and the RADIUS server. The shared secret is never

 

sent over the network.

Shared Use

An IP dial-up network whose use is shared by two or more organizations. Shared use networks typically

Network

implement distributed authentication and accounting in order to facilitate the relationship amongst the

 

sharing parties.

Silently Discard

RADIUS discards the packet without further processing. The server logs an error, including the

 

contents of the silently discarded packet, and records the event in a statistics counter.

SLIP

Serial Line Internet Protocol is TCP/IP over direct connections and modems, which allows one

 

computer to connect to another or to a whole network.

SMDS

Switched Multi-megabit Data Service is a high-speed Metropolitan-Area Networking technology that

 

behaves like a LAN.

SSHA

Netscape’s (iPlanet) enhancement of the SHA-1 algorithm which includes salted password data.

SNAP

SubNetwork Access Protocol is used when a SAP definition does not exist for the encapsulated user

 

data protocol.

SSL

Secure Socket Layer is the protocol defined by Netscape that is used for encryption and authentication

 

between two Internet entities. It uses public/private key certificates instead of shared secrets.

SVC

Switched Virtual Circuit is an L2TP-compatible media on top of which L2TP is directly encapsulated.

 

SVCs are dynamically created, permitting tunnel media to be created dynamically in response to

 

desired LNS-LAC connectivity requirements.

Cisco Access Registrar 3.5 Concepts and Reference Guide

 

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3.5 specifications

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