Terminal Trove mentioned Matt Hartley's netwatch tool as its "tool of the week:" netwatch is a network diagnostic tool for the console, and it's pretty comprehensive, showing a ton of information about network traffic in a quite reasonable, useful interface.
It's got eight tabs, covering every interface and its send/receive rates and volume, active connections with named processes and pids, ICMP health probes to your gateway and DNS, latency heatmaps, Gannt connection timelines, and, with proper permissions, live packet capture with protocol inspection, with export to standard .pcap files.
You can even pipe network snapshots to an Ollama instance, if you have one, to show anomalies and security observations.
It's trivial to install, and it's definitely interesting. The claim of being "like htop for your network" is pretty justified from the looks of it.