Couple of options here. If you have enabled the admin port:
telnet localhost 5001
Once connected, you'll be able to do a lot, but the two key commands are:
state and status
The state or status should be able to tell you if you are connected or not. You can also do a "state on" and "status on" which will send you information back if things change.
Also, let's say you're side of the tunnel has ip 10.0.0.5 and the other side has 10.0.0.6, from your host, trying and ping 10.0.0.6. If you get a response, you're connected and the appropriate routes, etc are in place. If not, something's wrong (And see above on the state/status).
Also, a traceroute should show both the 10.0.0.5 and 10.0.0.6.