Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Radius shopping experience:

1. Compare - without doubt the biggest advantage that the Radius offers shoppers today is the ability to compare thousands of Radius at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.

2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about

3. Testimonials - don't know anybody that has bought a Radius? Wrong! If the Radius is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.

4. Questions - Got a question about Radius then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Radius? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Radius and build up a picture of their reputation for sales, returns, customer service, delivery etc.

6. Returns - still worried that even after all of the above your Radius wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Radius then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Radius site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Radius, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Radius, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.



Remote Authentication Dial In User Service (RADIUS) is an AAA_protocol for applications such as network access or IP mobility. It is intended to work in both local and roaming situations.

Many networks services (including corporate networks and public Internet service provider using modem, DSL, or wireless 802.11 technologies) require you to present security credentials (such as a username and password or security certificate) in order to connect on to the network. Before access to the network is granted, this information is passed to a Network Access Server (NAS) device over the link-layer protocol (for example, Point-to-Point Protocol (PPP) in the case of many dialup or DSL providers), then to a RADIUS server over the RADIUS protocol. The RADIUS server checks that the information is correct using authentication schemes like Password authentication protocol, Challenge-handshake authentication protocol or Extensible Authentication Protocol. If accepted, the server will then indicate to the NAS that you are authorized to access the network. RADIUS also allows the authentication server to supply the NAS with additional parameters, such as

The RADIUS protocol does not transmit passwords in cleartext between the NAS and RADIUS server (not even with PAP protocol), but in hidden, using a rather complex operation instead, which involves MD5 hashing and shared secret, as described in references.

RADIUS is also commonly used for accounting purposes. The NAS can use RADIUS accounting packets to notify the RADIUS server of events such as

The primary purpose of this data is so that the user can be Bill (payment) accordingly; the data is also commonly used for statistical purposes and for general network monitoring.

Additionally RADIUS is widely used by VoIP service providers. It is used to pass login credentials of a Session Initiation Protocol end point (like a broadband phone) to a SIP Registrar using digest authentication, and then to RADIUS server using RADIUS. Sometimes it is also used to collect call detail records (CDRs) later used, for instance, to bill customers for international long distance.

RADIUS was originally specified in an RFI by Merit Network in 1991 to control dial-in access to NSFnet. Livingston Enterprises responded to the RFI with a description of a RADIUS server. Merit Network awarded the contract to Livingston Enterprises that delivered their PortMaster series of Network Access Servers and the initial RADIUS server to Merit. RADIUS was later (1997) published as RFC 2058 and RFC 2059 (current versions are RFC 2865 and RFC 2866). Now, several commercial and open-source RADIUS servers exist. Features can vary, but most can look up the users in text files, Lightweight Directory Access Protocol servers, various databases, etc. Accounting records can be written to text files, various databases, forwarded to external servers, etc. Simple Network Management Protocol is often used for remote monitoring. RADIUS proxy servers are used for centralized administration and can rewrite RADIUS packets on the fly (for security reasons, or to convert between vendor dialects).

RADIUS is a common authentication protocol utilized by the 802.1X security standard (often used in wireless networks). Although RADIUS was not initially intended to be a wireless security authentication method, it improves the Wired Equivalent Privacy encryption key standard, in conjunction with other security methods such as Extensible Authentication Protocol-Protected Extensible Authentication Protocol.

RADIUS is extensible; many vendors of RADIUS hardware and software implement their own variants using Vendor-Specific Attributes (VSAs).

RADIUS is used by RSA Security SecurID to enable strong authentication for access control; products such as PhoneFactor add two-factor authentication to legacy RADIUS applications that typically only support username and password authentication.

RADIUS uses UDP ports 1812 or 1645 for Authentication and 1813 or 1646 for Accounting. For example, Microsoft RADIUS servers default to the higher ports but Cisco devices default to the lower ports. Juniper Networks' RADIUS servers also defaults to the lower ports. The official IETF port number assignment is the higher port numbers 1812 and 1813.

The DIAMETER protocol is the planned replacement for RADIUS. DIAMETER uses Stream Control Transmission Protocol or Transmission Control Protocol while RADIUS uses User Datagram Protocol as the transport layer.

Standards The RADIUS protocol is currently defined in:

Other relevant RFCs are:

See Also

External links



Remote Authentication Dial In User Service (RADIUS) is an AAA_protocol for applications such as network access or IP mobility. It is intended to work in both local and roaming situations.

Many networks services (including corporate networks and public Internet service provider using modem, DSL, or wireless 802.11 technologies) require you to present security credentials (such as a username and password or security certificate) in order to connect on to the network. Before access to the network is granted, this information is passed to a Network Access Server (NAS) device over the link-layer protocol (for example, Point-to-Point Protocol (PPP) in the case of many dialup or DSL providers), then to a RADIUS server over the RADIUS protocol. The RADIUS server checks that the information is correct using authentication schemes like Password authentication protocol, Challenge-handshake authentication protocol or Extensible Authentication Protocol. If accepted, the server will then indicate to the NAS that you are authorized to access the network. RADIUS also allows the authentication server to supply the NAS with additional parameters, such as

The RADIUS protocol does not transmit passwords in cleartext between the NAS and RADIUS server (not even with PAP protocol), but in hidden, using a rather complex operation instead, which involves MD5 hashing and shared secret, as described in references.

RADIUS is also commonly used for accounting purposes. The NAS can use RADIUS accounting packets to notify the RADIUS server of events such as

The primary purpose of this data is so that the user can be Bill (payment) accordingly; the data is also commonly used for statistical purposes and for general network monitoring.

Additionally RADIUS is widely used by VoIP service providers. It is used to pass login credentials of a Session Initiation Protocol end point (like a broadband phone) to a SIP Registrar using digest authentication, and then to RADIUS server using RADIUS. Sometimes it is also used to collect call detail records (CDRs) later used, for instance, to bill customers for international long distance.

RADIUS was originally specified in an RFI by Merit Network in 1991 to control dial-in access to NSFnet. Livingston Enterprises responded to the RFI with a description of a RADIUS server. Merit Network awarded the contract to Livingston Enterprises that delivered their PortMaster series of Network Access Servers and the initial RADIUS server to Merit. RADIUS was later (1997) published as RFC 2058 and RFC 2059 (current versions are RFC 2865 and RFC 2866). Now, several commercial and open-source RADIUS servers exist. Features can vary, but most can look up the users in text files, Lightweight Directory Access Protocol servers, various databases, etc. Accounting records can be written to text files, various databases, forwarded to external servers, etc. Simple Network Management Protocol is often used for remote monitoring. RADIUS proxy servers are used for centralized administration and can rewrite RADIUS packets on the fly (for security reasons, or to convert between vendor dialects).

RADIUS is a common authentication protocol utilized by the 802.1X security standard (often used in wireless networks). Although RADIUS was not initially intended to be a wireless security authentication method, it improves the Wired Equivalent Privacy encryption key standard, in conjunction with other security methods such as Extensible Authentication Protocol-Protected Extensible Authentication Protocol.

RADIUS is extensible; many vendors of RADIUS hardware and software implement their own variants using Vendor-Specific Attributes (VSAs).

RADIUS is used by RSA Security SecurID to enable strong authentication for access control; products such as PhoneFactor add two-factor authentication to legacy RADIUS applications that typically only support username and password authentication.

RADIUS uses UDP ports 1812 or 1645 for Authentication and 1813 or 1646 for Accounting. For example, Microsoft RADIUS servers default to the higher ports but Cisco devices default to the lower ports. Juniper Networks' RADIUS servers also defaults to the lower ports. The official IETF port number assignment is the higher port numbers 1812 and 1813.

The DIAMETER protocol is the planned replacement for RADIUS. DIAMETER uses Stream Control Transmission Protocol or Transmission Control Protocol while RADIUS uses User Datagram Protocol as the transport layer.

Standards The RADIUS protocol is currently defined in:

Other relevant RFCs are:

See Also

External links



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