> Internal-only names should not look like subdomains of public DNS names. Since when? I, and many other people I know, have been doing that for decades. If I

> Internal-only names should not look like subdomains of public DNS names. Since when? I, and many other people I know, have been doing that for decades. If I (the company) own example.com, I can choose to have some sub-domains internal-only, some external-only, some DNS records resolve to the same IP value regardless of in/outside, and other DNS records resolve to different IP values depending on in/outside. * https://en.wikipedia.org/wiki/Split-horizon_DNS https://en.wikipedia.org/wiki/Split-horizon_DNS