Yes, the knowledgeable user can bypass by changing settings after the browser is running. I don't know of any fix for this, but I haven't pursued that angle.
A better solution would be to steer the workstations to one LTSP server that is allowed or to a different one that isn't allowed, based on DHCP. Then typical IP-based rules would work. But of course that would require two servers.
Or just have 2 NetCards in 1 LTSP_server with (of course) different IPs -- 1st for yes_Internet 2nd for no_Internet (or 4 network cards & so on).
Peter www.lentus.sk
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