On Wed, 2022-02-23 at 08:23 -0800, Mike Wright wrote:
> If you are using a hosted nameserver you will have to contact them
> and request a PTR record for 172.16.96.20 that points to
> centos8-opstcore-vm.homenet172-16-96.com.
I don't think you could use that with an external DNS, 172.16.0.0 is
one of the private LAN IP ranges, and shouldn't be able to traverse a
network.
Public and private IP address ranges
Class A: 10.0.0.0 — 10.255.255.255.
Class B: 172.16.0.0 — 172.31.255.255.
Class C: 192.168.0.0 — 192.168.255.255.
Of course they could have one of /those/ service providers which do
NATing and don't give their clients public IPs, but they're uncommon.
At least that range has about one million available addresses, class C
only has about sixty-five thousand addresses (might not be enough for a
very large ISP).
But generally speaking, anybody using those IP addresses needs to run a
nameserver of some kind within their own LAN.
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