Got it working
I tried some tweaking of my router (it has a Shoutcast setting which is set up for ports 8000-8005) and changed the port in gnump3d to port 8001. Then I disabled my no-ip program and just used my current IP address. I went to a pc outside my network, opened up firefox and typed:
http://1234.IP Addy.7890:8001
I was very pleased to see a web page that GNUmp3 made and I am now streaming....for today! I now need to figure out the write permissions in no-ip...or run no-ip as root. Is that safe?