PAT is really secure?

From: Antonio.P (antonio.p@llibero.it)
Date: 03/07/03 

From: "Antonio.P" <antonio.p@llibero.it>
Date: Fri, 07 Mar 2003 16:22:29 GMT

Hi to all in group.
I have installed a new flat adsl line with a router configured in PAT (port
address traslation). I have several private IP address in my internal lan
and only an address on the Internet.
I can see the Internet from my lan pcs but nobody can connect to my lan pc
from Internet.

So I don't need a firewall becouse the PAT configuration protect my lan or I
also need a firewall??

Thank you.

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