Comment Traffic Monitoring when not using DD-WRT (Score 1) 319
I have a D-Link DIR-655 that I haven't taken the time to update from the factory firmware. No traffic usage monitoring at all in the stock firmware, so I grabbed a "UPnP Gateway Traffic Monitor" applet that runs in Windows.
I'm using this: http://www.d-bross.com/en/downloads/
The software seems totally lame, but apparently the key phrase to search for is "UPnP Traffic Monitor" and there are a couple little cruddy things that will monitor your WAN interface in some way.
A simple not-quite-perfect fix for monitoring traffic, says I.