Priority for my IP

Hi.
In this time of covid emergency, the speed of my server in Germany from Italy users is sometimes going down … A server with 1gbps speed sometimes can reach only 250 Mbps… after this bandwidth usage it start to create me problems…

I’m using it to stream rtmp video , when it reach 250 viewers connected at 1mbps , my connection that stream the video source, start to go in buffer… And the video stream start to drop frames…

I can prioritize reserved bandwidth for a specified ip to avoid this problem?