Network Logger Pro actively tests your network connection on a regular schedule that you can customize, and it also passively samples all traffic from all your network interfaces.
Unlike purely passive network interface monitors, which only report on your network usage, Network Logger provides a consistent record of network behavior all the time, allowing you to see when your network is the fastest, when it is the slowest, and what your outage history looks like. If there are certain times of day or week that your network slows down or has an outage, Network Logger Pro will show you.