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This lab compares clean and impaired link conditions between two Linux endpoints.
Check the client address, then ping the server to establish a clean baseline.
On the server, start an iperf3 listener before measuring throughput.
Run the same client test to record the baseline modeled throughput.
Close the client terminal and click the cable to open Link impairment.
Choose Degraded MPLS and apply the profile to this cable.
Reopen the cable settings to inspect its current bandwidth, latency, jitter and loss.
Ping the same server again and compare the round trip times with the baseline.
Repeat the throughput test with the same endpoints and options.
These are modeled lab results, not measurements of your own network or hardware.
The Failed transport profile sets the modeled loss value to one hundred percent.
Ping still shows reachability here; loss settings do not directly drop ICMP echo replies.
Reset the cable to perfect and reopen the settings to confirm it is clear.
Repeat ping and the throughput test to confirm that the clean path has recovered.
On the server, press Control C to stop the listener.
A new client test is now refused because the listener is stopped, even though ping still succeeds.
The link is restored and the test listener is stopped. Compare the same test before and after each change.