[Devil-Linux-discuss] how to setup DL firewall to block "teamviewer"

Sir ,
I'm using DL now for more then a year, no serious issues :)))))))
As i only have a small business,I just figured out my staff is bypassing  
my dl firewall by using teamviewer!
they have complete remote control access over all files and pc's which are  
running windows
so stealing confidential information is very easy(white collar criminals!!)
I've seen on the web they even have teamviewer for linux... so also linux  
pc's are vulnerable

I have no idea how to block this

If one of you have a solution,please let me know

best regards
Gudy
Saigon,vietnam

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