Two RADIUS Server in 1 Cisco Router

Answered Question
Mar 6th, 2010
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Hi,


Just need to know if it is possible to use two RADIUS Server in 1 Cisco Router. The first RADIUS Server will authenticate remote users to access our internal LAN while the other RADIUS Server will authenticate users who will access the routers. The reason we can't use the same RADIUS server for authenticating remote users and router users is due to our contract with our supplier (long story!).


Anyways, if it is possible, could someone help me how to do this or give me the link of the documentation.


Thanks

Correct Answer by jedubois about 7 years 2 months ago

Yes this is the way to do it.  You will have to user two different methods as well.


radius-server 1.1.1.1 key login

radius-server 2.2.2.2 key login

radius server 3.3.3.3 key remote

radius server 4.4.4.4 key remote


aaa-server group telnet protocol radius

     server 1.1.1.1

     server 2.2.2.2

aaa-server group remoteaccess protocol radius

     server 3.3.3.3

     server 4.4.4.4


aaa authentication login default group remoteaccess

aaa authentication login TEL group telnet


line vty 0 4

     login authentication TEL

line con 0

     loging authentication TEL


This is an example that will allow your telnet access to the router to use one server group

while allowing your remote access users to use the other radius servers.

--Jesse

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KARUPPUCHAMY MA... Sat, 03/06/2010 - 00:53
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Hi,


We cannot use both radius server's at a time.


we can configure two or more radius server in cisco routers/switches, but only one radius server will be active at a time.


If any authentication is coming from the client to router, it will forward to the primary radius server, if primary server not availbale then it will forward the request to secondary radius server.


But for your request we can give work around that,


1.Configure one radius server for routers authentication users and make another one for remote users.


2.Configure Database forwarding in first radius server saying that, if the requested user information is not available in local database, then forward that request to another radius server.


3.If the request is coming from remote users, the request will reach the router and it will forward to first radius server.By any how, that user information won't be available in fisrt radius server,obviusly it will forward to another radius server and authentication will happen for the respective remote users.


regard

karuppu

sourabh_naik Mon, 03/08/2010 - 09:01
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Can't we create 2 different server groups with each RADIUS server belonging to respective group?

While configuring AAA authentication use specific server group.

Correct Answer
jedubois Mon, 03/08/2010 - 16:47
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  • Cisco Employee,

Yes this is the way to do it.  You will have to user two different methods as well.


radius-server 1.1.1.1 key login

radius-server 2.2.2.2 key login

radius server 3.3.3.3 key remote

radius server 4.4.4.4 key remote


aaa-server group telnet protocol radius

     server 1.1.1.1

     server 2.2.2.2

aaa-server group remoteaccess protocol radius

     server 3.3.3.3

     server 4.4.4.4


aaa authentication login default group remoteaccess

aaa authentication login TEL group telnet


line vty 0 4

     login authentication TEL

line con 0

     loging authentication TEL


This is an example that will allow your telnet access to the router to use one server group

while allowing your remote access users to use the other radius servers.

--Jesse

emerson.escuyos Tue, 05/04/2010 - 07:52
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Thanks for the help jesse, the one you suggested worked. Thanks also to other guys who replied..

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