Hi,
On Mon, 15 Dec 2008, Magnus Valle wrote:
> For example, if the class is just a lecture, then the students don't
> need a browser or a spreadsheet. But if the teacher, in the middle of
> the class, wanted the students to find the population of some country,
> the teacher could flip a switch on the control panel and the students
> had a web browser to go on-line with, and when they didn't need it
> anymore the teacher could turn it off again, so the students wouldn't
> just go check their email, or myspace, during class (which is a real
> problem in our school).
I think this issue might be best solved with iTalc. That isn't LTSP
specific, but can be used on LTSP. The teacher can lock the student's
desktops when they want the classes attention and unlock them when done.
http://italc.sourceforge.net/
If you really wanted to implement refusing net access to certain users on
an LTSP system you probably could do so using iptables refusing connections
based on a list of --uid-owner or better --gid-owner matches. For a
sufficiently experienced linux admin/developer that might be fairly
straightforward, but it sounds messy to use in practice (ie which users to
block etc.). I guess it could be done fairly quickly, you mainly need to
design and implement a sufficiently straightforward and safe interface that
a novice teacher could pick users or groups to block and not be at risk of
breaking things. Squid could probably be leveraged to do this either.
Gavin
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