firewalling

[Sebastiaan <sebastia@ch.twi.tudelft.nl>]

Hello,

I am configuring a computer as a firewall and ip-masquerading server.
Being on this adventure (it is my first time doing this), I have the
following questions:

- I did a nmap localhost and discovered that unwanted ports 'sunrpc' (111)
and 'printer' (515) are open. I have not found these in inetd.conf and I
do not know how to turn these off. I have already tried removing sunrpc.o
from the modules, but the computer would not do that. What is this port
used for?

- I have heard something about putting hosts who are portscanning you
automatically in hosts.deny, so that your computer is invisible for that
host. Where can I control that function (and put it on)?

- any other things worth knowing about private firewall ip-masq servers?

Thanks in advance!
Sebastiaan