Tools that should exist but I don't know off any.

I would like a tool that graphs all connectivity on a Linux or Unix box. I would like to be able to graphically tell which machines the machine I am working on is touching. I can do a netstat and find out which machines I am talking to but I would like to graph this. I think this would simplify the creation of firewall rules. currently I have a script that goes though the netstat output and the lsof output and determines which ports are in use or listening and then gives me a list of which hosts I am currently connected to and on which ports. netstat -an |grep EST |grep -v 127.0.0.1 |sort -u gives a good textual start.