Why do I receive more and more 'Intrusion-TCP fr', when I bring up the monitor.
The monitor software is going to report everything that attempts to get into your network as an intrusion. There is no way to know if it's a ping or a DNS request. You may be getting hit by DNS requesst. They are not intrusions, everybody that uses an outside DNS is going to get intrusions. There is no filter of any kind for the monitor software. It is setup to record all intrusion to show you that there is activity trying to come in. If the intrusion become a problem you will have to contact your ISP and ask them to find out where the IP address is coming from, they should be able to trace that down for you.