How to see VPN connection statistics?

I live in China, which requires me to use several VPN's to access the outside web. Occasionally, some VPN's are either totally blocked or suffer from high packet loss.

In Windows, it is easy to see statistics such as the packets in/out, the compression ratio, and most importantly for me, the packet loss ratio. Is there a way to see VPN connection quality information OS X?

Nothing as nice and easy as Windows provides, however you can get the info you require if you enable verbose logging on your PPTP connection:

1. Open System Preferences → Network.

2. Select your your VPN service from the list of services on the left.

3. Click Advanced….

   

4. Then tick Use verbose logging and click OK, then Apply.

   

5. In Terminal, run the following command:

   tail -f /var/log/ppp.log