I'm thinking my firewall 'Shorewall' encompasses an extensive enough design to
cover any attempts of intrusion that may occur, I do notice notwithstanding, 
that
although ports 0 and 1 are closed, they still show up on test like grc.com's
'shields-up' port scanner.

I know that 0 <nil> is not a port and yet it is a port as 0 is a number in our
world and port 1 has its function described, so why would these two ports
even show up?

On Debian it seems whatever firewall one uses these two ports are always visible
and closed, so if port 0 is not a port and and port 1 is always closed, why do 
they
announce themselves if pinged?

-- 
CK 


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