Carrying on the theme of my previous message here is an article about
firewalls on Ubuntu and two choices. By default Ubuntu doesn't install
a firewall because it doesn't listen on inbound ports by default but
if you enable any listening services you will want a firewall:
http://www.linux.com/article.pl?sid=06/06/26/1556259
--
Ian McDonald
Web:
http://wand.net.nz/~iam4
Blog:
http://imcdnzl.blogspot.com
WAND Network Research Group
Department of Computer Science
University of Waikato
New Zealand