We recently were contacted by an organization facing a troublesome issue: the RTT was miss behaving causing their jitter buffer to drop packets and impacting the video delivery. All they knew was that the events were short lived, and they did not know if it was the sender, local network, ICP or destination equipment. They could not find anything to help identify the problem. Standard tools could not show any anomality.

AlvaLinks was commissioned to assist. AlvaLinks deployed two of its probes and in a brief time identified the problem: sporadic RTT, Latency and Jitter events.

In the picture below one can see an increase of RTT and jitter for a brief period.

This event was immediately correlated to a specific HOP in the ICP path, see:

When correlated to the Video Alarms, it was found to be at the same time.

This was the smoking gun that no one could identify. With this evidence in hand, we empowered the customer with the information needed to approach the ICP to resolve this issue.