I have enabled the proxy in Zentyal and made a filter profile . I blocked all the trafic and allowed access to specified domains (in Domains and URL rules) . Now I need to allow access to multiple IP's, so I need to insert IP's from 192.168.1.1 to 192.168.254.254. I tried something like 192.168.0.0/16 , but it didn't seem to work. Any idea about the solution ? Thx !