A friend of mine was wondering how Port Forwarding works, so I decided to whip up a post to try to explain it (with pictures! …well, diagrams at least).
Let’s start off with a single computer connected directly to the internet (with a cable or DSL modem, or something).
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I was wondering if there was a way to monitor hard drive use in a terminal the same way it is possible to monitor CPU and RAM usage with top. After a quick search I found a post on the OC Forums that suggests install sysstat, which does exactly what I want. Installation is simple:
sudo apt-get install sysstat
Then run the utility with:
iostat
You can also set it to automatically refresh by putting the number of seconds to refresh in after the command. For example, to refresh every five seconds, type:
iostat 5