I would also suggest not to use nettest.
There at least a few issues that are not solved.
About 2 years ago i contacted the guy who wrote this part of the code. He mentioned that there are indeed issues, but that he doesn't work on it anymore.
So i think there isn't anyone working on this plugin anymore.
This was enough reason for me to look for an alternative.
I started with torquenet, but had problems with combining it with the CS libraries.
Then i tried RakNet, which turns out to works fine.
I would suggest to download the code, study the examples and use it for your CS-application.
I would not use HawNL: although it abstracts the "core" network communication, the level of abstraction is too low. RakNet does "object-synchronisation" out of the box.
So basicaly you define classes that contain the state of the objects to be shared (like position, orienation etc) and connect these to your CS objects, like the Actor. Raknet will take care of synchronising the updates of the state to all objects on the network...
In case you are working on a commercial product, the licence fee for using RakNet is quite low
(btw, i do not work for RakNet