Fallbacks

Contents

This scenario shows how to set up a fallback mechanism for RADIUS/TACACS+ through Telnet/SSH.

Test Authenticaction Fallback

Description

This scenario checks all the different combinations of RADIUS/TACACS+ authentication with/without fallback configuration through SSH and Telnet. The user baduser is configured in the local database, but it is not authorized in the remote server. Therefore, if the server is reachable or if local fallback is not specified, login should fail.

Scenario

Example 1

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 10.215.168.1
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.323 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.323/0.323/0.323/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 2

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 10.215.168.1
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.213 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.213/0.213/0.213/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 3

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 10.215.168.1
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV
set system aaa group tacacs GROUP local-vrf test
set interfaces ethernet eth0 vrf test
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.261 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.261/0.261/0.261/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 4

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 10.215.168.1
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV
set system aaa group tacacs GROUP local-vrf test
set interfaces ethernet eth0 vrf test

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.190 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.190/0.190/0.190/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 5

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 10.215.168.1
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.349 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.349/0.349/0.349/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 6

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 10.215.168.1
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.200 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.200/0.200/0.200/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 7

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 10.215.168.1
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV
set system aaa group radius GROUP local-vrf test
set interfaces ethernet eth0 vrf test
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.321 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.321/0.321/0.321/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 8

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 10.215.168.1
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV
set system aaa group radius GROUP local-vrf test
set interfaces ethernet eth0 vrf test

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.166 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.166/0.166/0.166/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 9

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 1.2.3.4
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.263 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.263/0.263/0.263/0.000 ms

Note

In this case, SSH and Telnet connection will be successful, because the tacacs server, i.e., method 1, is not reachable and; therefore, the next method will be attempted (local method) and it will allow the authentication.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:
Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

baduser@osdx$

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\nLast login: Thu Nov 23 23:43:53 UTC 2023 from 127.0.0.1 on pts/0

Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

baduser@osdx$

Example 10

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 1.2.3.4
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.171 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.171/0.171/0.171/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 11

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 1.2.3.4
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV
set system aaa group tacacs GROUP local-vrf test
set interfaces ethernet eth0 vrf test
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.300 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.300/0.300/0.300/0.000 ms

Note

In this case, SSH and Telnet connection will be successful, because the tacacs server, i.e., method 1, is not reachable and; therefore, the next method will be attempted (local method) and it will allow the authentication.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:
Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

Last login: Thu Nov 23 23:43:53 2023 from osdx
baduser@osdx$

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\nLast login: Thu Nov 23 23:44:21 UTC 2023 from 127.0.0.1 on pts/0

Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

baduser@osdx$

Example 12

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group tacacs GROUP
set system aaa server tacacs SRV address 1.2.3.4
set system aaa server tacacs SRV key 1234
set system aaa group tacacs GROUP server SRV
set system aaa group tacacs GROUP local-vrf test
set interfaces ethernet eth0 vrf test

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.153 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.153/0.153/0.153/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 13

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 1.2.3.4
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.330 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.330/0.330/0.330/0.000 ms

Note

In this case, SSH and Telnet connection will be successful, because the radius server, i.e., method 1, is not reachable and; therefore, the next method will be attempted (local method) and it will allow the authentication.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:
Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

Last login: Thu Nov 23 23:44:21 2023 from osdx
baduser@osdx$

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\nLast login: Thu Nov 23 23:44:49 UTC 2023 from 127.0.0.1 on pts/0

Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

baduser@osdx$

Example 14

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 1.2.3.4
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 count 1 size 56 timeout 1

Show output

PING 10.215.168.1 (10.215.168.1) 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.180 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.180/0.180/0.180/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

Example 15

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 1.2.3.4
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV
set system aaa group radius GROUP local-vrf test
set interfaces ethernet eth0 vrf test
set system aaa list LIST method 2 local

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.250 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.250/0.250/0.250/0.000 ms

Note

In this case, SSH and Telnet connection will be successful, because the radius server, i.e., method 1, is not reachable and; therefore, the next method will be attempted (local method) and it will allow the authentication.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:
Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

Last login: Thu Nov 23 23:44:49 2023 from osdx
baduser@osdx$

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\nLast login: Thu Nov 23 23:45:18 UTC 2023 from 127.0.0.1 on pts/0

Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

baduser@osdx$

Example 16

Step 1: Set the following configuration in DUT0:

del service
del system aaa
del interfaces ethernet eth0 vrf
set service telnet
set system login aaa authentication LIST
set service ssh aaa authentication LIST
set system aaa list LIST method 1 group radius GROUP
set system aaa server radius SRV address 1.2.3.4
set system aaa server radius SRV key enq88RORo0P5x3Wtyxfwerkj45sdLKJdnvdSASDi
set system aaa group radius GROUP server SRV
set system aaa group radius GROUP local-vrf test
set interfaces ethernet eth0 vrf test

Step 2: Ping IP address 10.215.168.1 from DUT0:

admin@DUT0$ ping 10.215.168.1 vrf test count 1 size 56 timeout 1

Show output

ping: Warning: source address might be selected on device other than test.
PING 10.215.168.1 (10.215.168.1) from 10.215.168.111 test: 56(84) bytes of data.
64 bytes from 10.215.168.1: icmp_seq=1 ttl=64 time=0.212 ms

--- 10.215.168.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.212/0.212/0.212/0.000 ms

Note

In this case, SSH and Telnet connection will fail.

Step 3: Init an SSH connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ ssh baduser@127.0.0.1 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null

Show output

Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
baduser@127.0.0.1's password:

Step 4: Init a Telnet connection from DUT0 to IP address 127.0.0.1:

admin@DUT0$ telnet 127.0.0.1

Show output

\nTrying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
osdx login:\nPassword:\n
Login incorrect

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