TCP traffic stops after UDP traffic starts

[Chinmay Naik]

Hello, I am preparing a testbed with 8 different types of traffic as seen in the image attached below. ( Flow 1 is DASH TCP and Flow 8 is UDP On Off )

However I notice that when UDP constant bitrate (20Mbps) traffic starts in a scenario where bottleneck bandwidth is 100Mbps, all the TCP flows seems to stop after some time  and only UDP continues.

Can you help me figure out the problem. Attaching Code files and modified src files also.

Thanks!