I have simulated network latency with netem and It's great. Now I want to simulate unplugged network cable or when server goes down. I need this to make testing of my application easier and I couldn't find anything on the web that would help me. My servers are virtual CentOS instances and they are on Virtualbox. I want to do this from a php web page.
I assume you mean that your network cable is unplugged. You didn't specify.
Just bring the interface down. For example, with eth0:
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On your virtualbox console window, you should have a Machine menu pull down. Under that one there are several actions. One of which is Power off. You need to select that one for an immediate power down. This is the closest thing to yanking the power cord of a physical server.