ICMP 8 OPEN

[Daniel Robitaille]

> running 'netstat - a' will (if my memory serves me correctly) give you
> the full rundown on all open ports.  Most of these will relate to your
> incoming email, web connections, irc, ssh and the other things most of
> us run 24/7, plus the local sockets used in your programs.  You need to
> look for tcp, utp and icmp.  But if you have a fresh ubuntu machine the
> list will be dramatically shorter than it would be on a comparable
> machine due to the fact (as you found out) most services are turned off
> by default.
> 

nmap is a good command to scan your own machine to see which ports are
open to the world.    On a default freshly-installed Ubuntu machine 
there should be none.