Is there are way to force Windows 2008R2 DHCP Server to update all DNS entries for all current leases?
(Guess the server-side equivalent of ipconfig /registerdns)
We had a configuration issue with our dynamic DNS and DNS is badly out of sync with the current leases. It's taking days to catch up now that we've fixed (I think) the original issue.
Best Answer
I'm afraid that you're going to have to approach this from the client end. Changing the timeouts is only going to help clients the next time they check in, which is usually after half the existing lease time, or sometimes during boot. You can approach this by manually forcing the clients to check in. You might be able to do this by tweaking some group policy settings, or by running a script to bulk "ipconfig /registerdns" on a bunch of clients.
If you insist on doing this from the server end of things, it should be possible to write a custom program to read the entries from a DHCP lease export, and register the addresses, but be sure to run it as the same account that DHCP uses for registrations, or else it may have trouble updating the entries in the future.