0:00 This lab compares clean and impaired link conditions between two Linux endpoints.

0:10 Check the client address, then ping the server to establish a clean baseline.

0:20 On the server, start an iperf3 listener before measuring throughput.

0:28 Run the same client test to record the baseline modeled throughput.

0:36 Close the client terminal and click the cable to open Link impairment.

0:43 Choose Degraded MPLS and apply the profile to this cable.

0:52 Reopen the cable settings to inspect its current bandwidth, latency, jitter and loss.

1:01 Ping the same server again and compare the round trip times with the baseline.

1:10 Repeat the throughput test with the same endpoints and options.

1:16 These are modeled lab results, not measurements of your own network or hardware.

1:25 The Failed transport profile sets the modeled loss value to one hundred percent.

1:36 Ping still shows reachability here; loss settings do not directly drop ICMP echo replies.

1:49 Reset the cable to perfect and reopen the settings to confirm it is clear.

1:59 Repeat ping and the throughput test to confirm that the clean path has recovered.

2:10 On the server, press Control C to stop the listener.

2:17 A new client test is now refused because the listener is stopped, even though ping still succeeds.

2:29 The link is restored and the test listener is stopped. Compare the same test before and after each change.