Linux RH8 Internet Connection Monitoring

At last!! I have finally configured my copy of Red Hat Linux 8 to use my usb isdn terminal, so have decided to use it to post on this site. I was just wondering if their are any tools (being a linux noob and all) for monitoring your internet connection i.e. Time online, connection speed, whether information is being/sent recieved etc. Any help much appreciated. Tomorrow will see me going through my 2 linux books to get up to speed.

Thanks

P.S. Why does Mozilla render the text so small in linux??