> ...just that without the need for NAT, perpetuated by ISPs only giving us one IP, I doubt anybody would have any ingress filtering at the border. I disagree.

> ...just that without the need for NAT, perpetuated by ISPs only giving us one IP, I doubt anybody would have any ingress filtering at the border. I disagree. Defaults are a powerful thing. If one's router ships with a default REJECT ingress firewall, a non-technical user is not likely to change it.