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Setup of UFW (Uncomplicated Firewall) on network that contains proxy

Trying to make a proper setup for UFW (Uncomplicated Firewall). I have network that's behind proxy. Setup I need it that some of the network computers have to be able to browse everywhere, and some ...
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User to access only to specific IP addresses

How can I setup Ubuntu box so logged user can access only to several IP addresses, on all protocols? Additional problem is that Ubuntu uses proxy to acceess to internet. Tried with UFW, but did not ...