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I teach in a school and have a cart of laptops that I set up with Edubuntu 12.04. I am using LanSchool to monitor their screens, remotely control them, blank their screens, etc. The functionality is limited however and website blocking has been incomplete and buggy for quite a while. I want to allow YouTube when students need to view something or even to listen to music while working for instance, but during testing or to refocus them I want to be able to block YouTube as quickly as possible. This works pretty well with LanSchool on Windows simply by clicking a button or two.

My school has a proxy server that blocks most of what I don't want students to access. However, I cannot quickly block and unblock sites during a class period on this proxy server since I have to send requests to another building and this takes hours or even days.

I can however run commands remotely through LanSchool and I also set up easy ssh access with keys. So what I need are commands that I can run to

  • Block/unblock all websites
  • Blacklist or block a set of sites
  • Whitelist a set of sites

I have played around with iptables but have not been able to get it working. I suspect some of my issues are due to all traffic being routed through the proxy server and so any attempt to regulate traffic using iptables fails. We primarily use Google Chrome since we use Google Apps on a daily basis.

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    There's also /etc/hosts. If you specify a line that says 127.0.0.1 youtube.com, then the computer won't be able to access youtube.com (note that, technically, Youtube videos don't come from that domain). – saiarcot895 May 1 '15 at 21:10
  • I have tried this and it does not work. It may be because all traffic is being routed through a proxy server. – HarlemSquirrel May 2 '15 at 22:10
  • Do you have access to the school's proxy server? I'm a little confused. Are you looking to block MORE on the laptops than is already blocked? If a site is blocked by the proxy and you dont have control of the proxy you can't fix that. – wlraider70 May 5 '15 at 13:57
  • I'm not looking to unblock things blocked by the proxy as I understand this would not work, but instead temporally block sites on a per machine basis allowed by the proxy. – HarlemSquirrel May 5 '15 at 16:38
  • The best way is to create a new network with its own proxy that redirect requests through NAT to the school network. You'll need a virtualmachine and lot's of work hours to setup and test, but it will be a joy to deploy. – perdigueiro Jun 20 '15 at 22:22

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