Today looking at my Cacti graphs I'm seeing a 5 Mbps sustained bandwidth. I'm guessing that is a stream that is going on from the PS Vue service, but I wanted to know for sure. Low and behold, my edge firewall (pfSesne) supports Netflow export. And in searching of Linux Netflow collectors I found my way to NTOP. So far I'm very impressed. More updates to come once I get flows going to it, but here is the install documentation that I used to install it on my CentOS 7 system.
https://devops.profitbricks.com/tutorials/install-ntopng-network-traffic-monitoring-tool-on-centos-7/
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