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Uhh... you can have a firewall without NAT, including one at the perimeter. This is a very common misunderstanding. NAT and firewalls are separate concepts. Yo
by api 16d ago
Uhh... you can have a firewall without NAT, including one at the perimeter.
This is a very common misunderstanding. NAT and firewalls are separate concepts. You can also have NAT with no meaningful firewall -- a port remapping NAT that allows anything through.
Most IPv6 networks are firewalled but there's no NAT.
- tptacek 16d agoI think this is not really a good way to divide up the space. It's obviously true that there are non-NAT firewalls. But NAT was introduced as a firewalling technique. In the first decade of firewalls, there was a whole taxonomy of different kinds of firewalls: application layer gateways, packet filters, "stateful" packet filters, and, yes, NAT.