$ sudo iftop
$ sar -n DEV 1 1
A consistent and expected range of Net IO varies depending on the specific workload and application. Generally, a steady and moderate flow of Net IO is indicative of healthy server activity.
If the Net IO is consistently low or negligible, it may indicate that the server is underutilized or possibly idle. This could be a sign that the server is not receiving the expected amount of data traffic.