How are notebook DNS records updated in Active Directory?

Question

Domain Name System

Hello.
There is an organization with many branches. Each branch has its own network and IP subnet. All branch networks are connected in VPN. There is also an external dial-in VPN (like PPTP) that users can also connect to. Routing is configured between networks, everything works. The Active Directory domain is used for authorization.
There are many employees with laptops who travel back and forth between branches.
When a user moves to another branch and gets an IP address there from a different subnet, his laptop's DNS entry should be updated. However, this does not always happen - it often happens that the address from the old subnet hangs.
Question: where to dig and how to treat? Under what conditions is a record updated in the domain DNS?

Answer 1

DNS changes immediately when you connect to the network, provided that the settings are set to automatically receive DNS records and the service is running. Also, the explicit ip2dns entry of your AD server is not specified in the hosts file.
The domain controller is searched for by the first local DNS server, if the address of your CD is not explicitly specified there, then it will search the Internet and then only in the second DNS record. For correct operation, it is necessary to explicitly specify the CD host in the local DNS server as the first one in the request.
Often there is a problem when connecting to a domain when the CD DNS server is second in the list of DNS servers.
Try to register the address to the CD on the gates with statics, so that there is an explicit indication of where to look for it

Answer 2

I would start by checking the obvious assumption that for some reason the laptop can't reach dns. This may be a subtle error in routing, and a firewall, and the wrong time, or even a banal tick for isolating clients on a Wi-Fi point. And in the end, look at the logs on laptops - if there were any errors when registering with dns, there will be entries about this.

Answer 3

Judging by the fact that manually (ipconfig / registerdns) registration passes, then most likely the problem is in the DHCP server.
Does restarting the laptop help?

Answer 4

You need to look in the logs of the laptop for records about the inability to update A / AAA records on DNS servers. There can be many reasons. From the Firewall to the Dns server itself. if it is not associated with AD, then there will be no updates to the records.