RADIUS servers receive user connection requests, authenticate the user, and then return the configuration information necessary for the client to deliver service to the user. A RADIUS server can act as a proxy client to other RADIUS servers or other kinds of authentication servers.
Short for Remote Authentication Dial-In User Service, an authentication and accounting system used by many Internet Service Providers (ISPs). When you dial in to the ISP you must enter your username and password. This information is passed to a RADIUS server, which checks that the information is
Why would I need a RADIUS server if my clients can connect and authenticate with Active Directory? RADIUS is an older, simple authentication mechanism which was designed …
Why would I need a RADIUS server if my clients can connect and
authenticate with Active Directory? RADIUS is an older, simple authentication mechanism which was designed to allow network devices (think: routers, VPN concentrators, switches doing Network Access Control (NAC)) to authenticate users. It doesn’t have any sort of complex membership requirements; given network connectivity and a shared secret, the device has all it needs to test users‘ authentication credentials. Active Directory offers a couple of more complex authentication mechanisms, such as LDAP, NTLM, and Kerberos. These may have more complex requirements – for example, the device trying to authenticate users may itself need valid credentials to use within Active Directory. When do I need a RADIUS server? When you have a device to set up that wants to do simple, easy authentication, and that device isn’t already a member of the Active Directory domain: Network Access Control for your wired or wireless network clients Web proxy „toasters“ that require user authentication Routers which your network admins want to log into without setting up the same account each and every place In the comments @johnny asks: Why would someone recommend a RADIUS and AD combination? Just a
two-step authentication for layered security? A very common combo is two factor authentication with One Time Passwords (OTP) over RADIUS combined with AD. Something like RSA SecurID , for example, which primarily processes requests via RADIUS. And yes, the two factors are designed to increase security („Something you have + Something you know“) It’s also possible to install RADIUS for Active Directory to allow clients (like routers, switches, ) to authenticate AD users via RADIUS. I haven’t installed it since 2006 or so, but it looks like it’s now part of Microsoft’s Network Policy Server .Best answer · 26All the comments and answers boiled down the RADIUS protocol to simple authentication . But RADIUS is a triple A protocol = AAA: authentication , authorization and accounting . RADIUS is a very extensable protocol. It works with key value pairs and you can define new ones on your own. Most common scenario is, that the RADIUS server returns authorization information in the ACCESS-ACCEPT response. So that the NAS can know, what the user will be allowed to do. Of course you can do this by quering LDAP groups. You could also do this using SELECT statements if your users where located in a database 😉 This is described in RFC2865. As a third part the RADIUS protocol also does accounting . I.e. the RADIUS client can communitcate with the RADIUS server to determine, how long a user may use the service provided by the RADIUS client. This is already in the protocol and can not be done with LDAP/Kerberos straightforward. (Described in RFC2866). Imho, the RADIUS protocol is much more of a mighty giant than we think today. Yes, due to the sorry concept of the shared secret. But wait, the originial kerberos protocol has the concept of signing timestamp with a symmetric key derived from your password. Does not sound better 😉 So when do you need RADIUS? Whenever you do not want to expose your LDAP!
Whenever you need standardized authorization information.
Whenever you need session information like @Hollowproc mentioned. Usually you need RADIUS when dealing wiht Firewalls, VPNs, Remote Access and network components.4RADIUS Servers have traditionally been the open source alternative for platforms using per-user authentication (think wireless network that needs username and password ) vs PreShared Key (PSK) architectures. In recent years, many RADIUS-based systems now offer the ability to tap into Active Directory using basic LDAP connectors. Again the traditional implementations of RADIUS are network access related vs. Active Directory which can have a whole range of uses/implementations. To answer your question, even if you can connect with AD creds, you may still need to use the RADIUS server to manage the session for the wireless client once they’ve authenticated via AD .2
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If you’re running a Windows Server, keep in mind you already have RADIUS capability. Before using a third-party server, look into the Internet Authentication Service (IAS) …
Microsoft Forefront Threat Management Gateway can use a RADIUS server for client authentication. This topic describes how to set up a RADIUS server to …
If on Friday night you had taken a pair of compasses and drawn a circle with a radius of five miles round the Woking sand pits, I doubt if you would have had one human being outside it, unless it were some relation of Stent or of the three or four cyclists or London people lying dead on the common, whose emotions or habits were at all affected by …
RADIUS is a standard protocol to accept authentication requests and to process those requests. The Azure Multi-Factor Authentication Server can act as a RADIUS server. Insert it between your RADIUS client (VPN appliance) and your authentication target to add two-step verification. Your
Applies To: Windows Server (Semi-Annual Channel), Windows Server 2016 When you deploy Network Policy Server (NPS) as a Remote Authentication Dial-In User Service (RADIUS) server, NPS performs authentication, authorization, and accounting for connection requests for the local domain and for domains
The world’s leading RADIUS server. The project includes a GPL AAA server, BSD licensed client and PAM and Apache modules. Full support is available from NetworkRADIUS.