Re: Is NAT can provide some kind of protection?

There is a least one situation where NAT *does* provide a small amount of necessary security.

Try this at home, with/without NAT:

1. Buy a new PC with Windows installed 2. Install all security patches needed since the OS was installed

Without NAT, you're unpatched PC will get infected in less than 1 minute.

Its the firewall included with the NAT which protects against the infection, not the NAT. So you can remove the NAT, leave the firewall, and be just as secure.