I don't think any dos command can do that. There is freeware you can try. I know a program named WFilter shall be helpful, it helps you to monitor bandwidth, restrict websites and application control.
http://www.imfirewall.us/wfilterfree.htm
As I know, WFilter free is a freeware for internet filtering.
You need to setup a mirroring port in your switch and connect the WFIlter computer to the mirroring port to monitor and filter internet access.