IV. Thou Shalt Not Tinker with Thine Network Configuration Unless Thou Knowest What Thou Art Doing

Networks are finicky things. After yours is up and running, don't mess with it unless you know what you're doing. It may be tempting to log on to your firewall router to see whether you can tweak some of its settings to squeeze another ounce of performance out of it. But unless you know what you're doing, be careful! (Be especially careful if you think you do know what you're doing. It's the people who think they know what they're doing-and think no more about it-who get themselves into trouble!)