Ambraven :verifinking:​
@Ambraven@social.mochi.academy  ·  activity timestamp 3 days ago

Ok so another DNS question:

I (my employer) got a server on ip1 but for reasons we migrated stuffs on it to serv on ip2.

We changed the DNS reccords so that service.domain.com points to ip2 now. It's been more than a week, and if I use say 1.1.1.1 has a DNS server, it works fine.

However if I use whatever DNS server my work dhcp server is pointing me to, service.domain.com is still pointing at ip1.

What gives ?
Ryan Bolger
@rmbolger@mastodon.social  ·  activity timestamp 3 days ago
@Ambraven Your internal network may be serving a different copy of the domain.com zone. This is relatively common and known as split-brain or split-horizon DNS so that internal queries get internal IP responses and external queries get external IP responses. In this case, you’d need to make the same change to the internal record that was made to the external record unless the service has a separate internal IP in which case you’d use that.