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.
Yes this is the way to do it. You will have to user two different methods as well.
radius-server 184.108.40.206 key login
radius-server 220.127.116.11 key login
radius server 18.104.22.168 key remote
radius server 22.214.171.124 key remote
aaa-server group telnet protocol radius
aaa-server group remoteaccess protocol radius
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.