I'm having a hard time getting right in my mind how I need to go about
doing my packet filtering. Do I want to deny everything, and then
scale back from there, or just block certain things. Also, how do I
sort out what I need to filter for the destination or the source. I'm
having a hard time getting my mind around this.

Would anyone happen to have a link to a good netware packet filtering
tutorial? I've printed out and a read the bordermanager(3.7) manual on
packet filtering, but I'm still not fully grasping the logic behind it.