I think you are really confused as to what a firewall actually is, there is only one firewall, that is built into the kernel, called netfilter. All the rest are just front-ends, ufw, gufw, iptables etc, to make it easier to create firewall rules. Everything else you mentioned in your last post, are just different secure methods for other services. AEP is a is a secure, remote application access gateway, pgp/gnupgp is a way of encrypting email. The best thing you can do to secure your Ubuntu installation is to read and understand the stickies at the top of this
sub-forum. If you were really paranoid, you should be using one of the
BSD's, and completely get rid of any
Linux distributions and WIndows.
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