I m wondering how to go about monitoring network traffic on my Mac. Like the way activity monitor does it, showing the bytes / packets in and out.
I know it s a bit vague, but I m unsure of the best place to start.
EDIT: I m wanting to do this in code, not use an existing piece of software.
I just found the open source project, MenuMeters. It s got exactly what I m looking for.
You may want to look into programming with pcap. That s the library which drives tcpdump.
Use tcpdump for quick-n-dirty low-level command-line monitoring, and wireshark for the kitchen sink.
OTOH, if you just want to know the number of bytes/packets (as opposed to their contents), try Net Monitor, which is commercial, unfortunately.
There are lot of paid & freeware applications. But if you a command line person like me, Try this:
nettop //displays network usage per application with lot of details
nettop (press h) //displays help menu
nettop (press c) //collapse and display brief info on network usage
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