Comment by ErroneousBosh

So, if you have NAT but a grossly misconfigured router, it might not be secure?

Quick question - do you think that "security by obscurity is not security"? And, as a follow-up, when you park your car do you ensure your laptop bag is out of sight, maybe locked away in the boot?

Because here's a mindblowing concept that'll change the way you see the world - you can have a door lock but it won't make you secure. You need to actually fit the lock to some sort of door.