In my copy of Knoppix 6.4.3, there is a menu choice under 'Preferences'
called 'Knoppix Firewall'. It doesn't do anything.

If my setup is like everyone elses, I can't imagine why there isn't
some ongoing discussion about this state of affairs.

I can't imagine that if nmap reports 'All 1000 scanned ports
on (my routers address) are closed', that that is the end of it.
Doesn't that leave 64,535 questions unanswered?

Can anyone orient me to some sense of reality here?
Is there no security concern beyond an nmap 1000 port test
for a machine running Knoppix?