How safe is it to leave your wifi public? I have a few computers (Mac, PC) would I be putting those computers on the network in danger? Or would it be a case of just burning bandwidth, and possible use for criminal activities?
closed as not constructive by Breakthrough, Wuffers, slhck♦, Linker3000, alex Jul 4 '11 at 8:13
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While it sounds like a neighbourly thing to do, it does put yourself at risk.
Use Facebook? It is trivial to hijack someone's account if you're on the same LAN. Same with many other online services that you may use.
Also, depending on the laws in your country, you could be held liable for actions taken "from" your network. So, someone using your network could launch a cyber-attack from your network, download child pornography or perhaps infringe copyrights and you'd be held liable.
Lock it up.
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It is reasonably unsafe, but it really does depend on what you do. If you tunnel everything through SSH to some safe site or only stick to HTTPS you're reasonably safe (although you could still have someone come in and try to exploit machines on the network). Chances are you don't though, in which case you aren't very safe at all.
See this story for instance: http://money.cnn.com/2010/12/14/technology/firesheep_starbucks/index.htm