I'm having a problem where my Ubuntu Server random stops working. I can't access my websites, can't get my email, can't login via SSH, etc. I've got two theories: one is that Ubuntu has some kind of power setting that shuts down Internet after x hours of inactivity or something, the other is that my router is being stupid.
Are there any power or Internet settings in Ubuntu that I should look at (through command line; no GUI installed)?