I sometimes connect my Ubuntu laptop to my phone's 3G connection via tethering. When connected to that network I don't want Dropbox to synchronize as I have a limited data plan. I do want it synchronize when connected to my work or home Wifi.
I am looking for a clean yet easy solution in linux and more specifically Ubuntu. A more sophisticated solution that would actually place caps on the bandwidth for Dropbox when connected to certain wifi ESSIDs is also desirable.