You do not need to have a Static IP to connect to OpenVPN. That I can assure you. If you are using some other VPN (IPSec, etc.) ignore this.
This is the info they gave me about connecting to their test VPN dl.dropboxusercontent.com/u/310 … %20LAB.zip
Note that in there they give the IP as 208.81.123.12 where you have 21 instead of 12.
Once you get connected, try to curl en.wikipedia.org/wiki/Private_network
Good luck! Check your tun-mtu, fragment, and mssfix! They matter.