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You have Wireless network ?– Sepahrad SalourCommented Apr 23, 2013 at 12:16
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What sort of environment?– Austin T FrenchCommented Apr 23, 2013 at 13:58
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Actually it's computer class. I would like to use iTalc (italc.sourceforge.net) to issue a command to all computers to disable Internet. At same time leaving local network working. Could block Internet at router/switch level but teachers should not have access to router. Wired by cable.– user219175Commented Apr 24, 2013 at 8:09
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possible duplicate of allowing local network access while blocking internet access– Ƭᴇcʜιᴇ007Commented Jul 15, 2013 at 11:19
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What is a firewall? --- The other question (linked by techie007) is already closed as a dupe of this, which is mildly confusing.– Ярослав РахматуллинCommented Jul 18, 2013 at 1:23
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