7.2.6 Packet Tracer – Configure Local AAA for Console and VTY Access Answers Version
Topology
7.2.6 Packet Tracer – Configure Local AAA for Console and VTY Access
Addressing Table
| Device | Interface | IP Address | Subnet Mask | Default Gateway | Switch Port |
|---|---|---|---|---|---|
| R1 | G0/1 | 192.168.1.1 | 255.255.255.0 | N/A | S1 F0/1 |
| S0/0/0 (DCE) | 10.1.1.2 | 255.255.255.252 | N/A | N/A | |
| R2 | G0/0 | 192.168.2.1 | 255.255.255.0 | N/A | S2 F0/2 |
| S0/0/0 | 10.1.1.1 | 255.255.255.252 | N/A | N/A | |
| S0/0/1 (DCE) | 10.2.2.1 | 255.255.255.252 | N/A | N/A | |
| R3 | G0/1 | 192.168.3.1 | 255.255.255.0 | N/A | S3 F0/5 |
| S0/0/1 | 10.2.2.2 | 255.255.255.252 | N/A | N/A | |
| PC-A | NIC | 192.168.1.3 | 255.255.255.0 | 192.168.1.1 | S1 F0/2 |
| PC-B | NIC | 192.168.2.3 | 255.255.255.0 | 192.168.2.1 | S2 F0/1 |
| PC-C | NIC | 192.168.3.3 | 255.255.255.0 | 192.168.3.1 | S3 F0/18 |
Objectives
- Configure a local user account on R1 and configure authenticate on the console and vty lines using local AAA.
- Verify local AAA authentication from the R1 console and the PC-A client.
Background / Scenario
The network topology shows routers R1, R2 and R3. Currently, all administrative security is based on knowledge of the enable secret password. Your task is to configure and test local and server-based AAA solutions.
You will create a local user account and configure local AAA on router R1 to test the console and vty logins.
- User account: Admin1 and password admin1pa55
The routers have also been pre-configured with the following:
- Enable secret password: ciscoenpa55
- OSPF routing protocol with MD5 authentication using password: MD5pa55
Note: The console and vty lines have not been pre-configured.
Note: Newer IOS images use more secure encryption hashing algorithm; however, the IOS version currently supported in Packet Tracer uses MD5. Always use the most secure option available on your physical equipment.
Part 1: Configure Local AAA Authentication for Console Access on R1
Step 1: Configure a local username on R1.
Configure a username of Admin1 with a secret password of admin1pa55.
R1(config)# username Admin1 secret admin1pa55
Step 2: Configure local AAA authentication for console access on R1.
Enable AAA on R1 and configure AAA authentication for the console login to use the local database.
R1(config)# aaa new-model R1(config)# aaa authentication login default local
Step 3: Configure the line console to use the defined AAA authentication method.
Enable AAA on R1 and configure AAA authentication for the console login to use the default method list.
R1(config)# line console 0 R1(config-line)# login authentication default
Step 4: Verify the AAA authentication method.
Verify the user EXEC login using the local database.
R1(config-line)# end %SYS-5-CONFIG_I: Configured from console by console R1# exit R1 con0 is now available Press RETURN to get started. ************ AUTHORIZED ACCESS ONLY ************* UNAUTHORIZED ACCESS TO THIS DEVICE IS PROHIBITED. User Access Verification Username: Admin1 Password: admin1pa55 R1>
Part 2: Configure Local AAA Authentication for vty Lines on R1
Step 1: Configure domain name and crypto key for use with SSH.
a. Use netsec.com as the domain name on R1.
R1(config)# ip domain-name netsec.com
b. Create an RSA crypto key using 1024 bits.
R1(config)# crypto key generate rsa general-keys modulus 1024 The name for the keys will be: R1.netsec.com % The key modulus size is 1024 bits % Generating 1024 bit RSA keys, keys will be non-exportable…[OK] *Mar 1 0:2:12.822: %SSH-5-ENABLED: SSH 1.99 has been enabled
Step 2: Configure a named list AAA authentication method for the vty lines on R1.
Configure a named list called SSH-LOGIN to authenticate logins using local AAA.
R1(config)# aaa authentication login SSH-LOGIN local
Step 3: Configure the vty lines to use the defined AAA authentication method.
Configure the vty lines to use the named AAA method and only allow SSH for remote access.
R1(config)# line vty 0 4 R1(config-line)# login authentication SSH-LOGIN R1(config-line)# transport input ssh R1(config-line)# end
Step 4: Verify the AAA authentication method.
Verify the SSH configuration SSH to R1 from the command prompt of PC-A.
PC> ssh –l Admin1 192.168.1.1 Open Password: admin1pa55
Answer Script
Router R1
enable config terminal username Admin1 secret admin1pa55 aaa new-model aaa authentication login default local line console 0 login authentication default ip domain-name netsec.com crypto key generate rsa general-keys modulus 1024 aaa authentication login SSH-LOGIN local line vty 0 4 login authentication SSH-LOGIN transport input ssh
Download Packet Tracer (.pka) file:
