It would appear as if rate limiting simply does not work when connected to a VPN, at least with my configuration. I'm currently running Mint 16, and have a 200 kB/s limit. When I am not connected via VPN, the limit is strictly adhered to, but as soon as I connect via VPN, the limit is completely ignored. I have also ensured that the rate limiting of peers that appear as being on the local LAN is enabled, but I imagine this has nothing to do with it. Any suggestions would be greatly appreciated, as I'd rather not have to kill btsync everytime I connect through VPN.