I just started working at a small-medium sized business after graduating school. So much of my knowledge is high level concepts without a lot of hands on.
My understanding that according to rfc1918 only the following IP ranges are for private IPs:
How does this concept work with NAT firewalls? Does it not apply to internal IP addresses behind a NAT firewall?
The reason I ask is because our internal network is on 220.127.116.11/24. My first thought when seeing this is that isn't private IP space. This internal network is behind a NAT firewall with an external IP of 74.4.9.x.
Does this setup make sense? Does it go against best practices? Can someone try and give me a brief explanation to firm up these concepts for me? Any links to relative reading would also be appreciated.