DD-WRT: possible to log bandwidth chart to file?

[Special K]

I am using DD-WRT v24-sp1 on a Linksys WRT54GL. If I go to the Status tab, then the Bandwidth tab, there are real time graphs of LAN, WAN, and wireless bandwidth. Is there any way to log these values and their associated sample times to a text file?

I know Windows has the perfmon utility that will log upstream and downstream bandwidth values to a file, but that only works for the PC you run it on. I'd like to see the same thing for the router.

Disclaimer: I posted this on the DD-WRT forums and it didn't get any responses, so I'm trying it here.

 

[Elixer]

You can use the GUI to save the data to a file I thought.
If you mean the actual chart, no, but, it is simple enough to export the data to some spreadsheet and produce a graph there.

 

[Special K]

To answer my own question, you need to enable the RFlow service in DDWRT. That causes the router to start broadcasting information on the LAN in the Cisco netflow format, which can then be collected by any network monitoring utility that supports netflow. I used the free Solarwinds netflow analyzer tool. The data it is collecting doesn't look correct, but that at least answers the question of whether or not it is possible to access it. The incorrect data might be a bug in DDWRT.