Packet Tracer 5.3 – RADIUS configuration

Configure telnet authentication on a 2811 router

This tutorial describes how to configure RADIUS authentication on a CiscoTM 2811 router for telnet access.

Router R1 :

  • FastEthernet 0/0 :
  • FastEthernet 0/1 :

RADIUS Server :
Client (Laptop0) :

Packet Tracer 5.3 - Router radius authentication
IOS configuration on R1
aaa new-model The first command, aaa new-model, tells the router that you are using either TACACS+ or RADIUS for authentication.
radius-server host key p@ssword Tells the router the IP address of the RADIUS server and the shared secret.
aaa authentication login default group radius local The aaa authentication command is used to start RADIUS authentication on the router as a defaul method for login.
line vty 0 15

login authentication default
Configuration of the vty interfaces for login


Learning RADIUS : recommended books


Wireless configuration (WPA)

This tutorial describes how to configure WPA entreprise authentication on a LinksysTM access point.
Linksys WRT300N :
RADIUS Server :
Laptop :
Tip : For security reasons, it is highly recommended to secure the RADIUS server behind a router (using ACL) or a firewall in production networks.

Packet Tracer 5.3 - WPA entreprise configuration
Packet Tracer 5.3 - Radius server configuration


  1. Add a Linksys AP and configure it’s IP address to (netmask
  2. Add a Server-PT device and configure it’s IP address to (netmask
  3. On the Server configuration page, configure the AAA Service with the following settings :
    1. Client Name : Linksys (Chose a name. Doesn’t need to match AP name)
    2. Client IP : IP address of the Linksys AP
    3. Client password : A shared secret with the AP (here : deltapassword)
    4. Create a new user (name : user1 – Password : test)
  4. Configure the wireless settings of the Linksys AP like in the screenshot above (WPA TKIP / Radius server IP / Shared secret)
  5. Add a laptop device and configure it with a PT-LAPTOP-NM-1W module (Drag and drop to replaces the original ethernet module)
  6. Configure the wireless settings of the laptop like in the screenshot above (WPA TKIP / User ID, Password)
  7. The connection should establish between the laptop and the AP.


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