I am currently using about 600gb a month and Comcast is about to start charging me for anything over 300gb. I need to find out which devices are using the most bandwidth so I can get it under control.
The newest airport extremes (the tower version that supports 802.11ac) do not support SNMP. Is there any other way to monitor bandwidth usage by device on my network?
PFSense, DD-WRT/Tomato, Peplink, or some other router in front of the Apple AirPort Extreme will likely be the best solution. Don't think there's an easier way unless you're running on a single machine for your whole network (not likely). All the routers I mentioned support realtime traffic monitoring. NetGear Nighthawks have this capability too.
You can always add a pfSense box (or other type of router / firewall) in between your LAN and your internet connection.
Comcast offers a Usage Data Meter on their website, but that has limited capability and shows only totals.
To continuously monitor usage by application you can use a number of 3d party apps, including:
Wireshark
To stay away from 3d party apps use the build in tools:
will show you usage by application and cumulative total between shutting down the network.
If you want to be more analytical you can use your Terminal:
Netstat -i will give you usefully information
I recommend:
Using the activity monitor to see what is going on
Use the Comcast to see the cumulative total between billing periods.
