Changing the primary DNS suffix of the computer does require a reboot. Changing a connection specific DNS suffix does not require a reboot.
Do I have to restart after changing DNS?
Changing DNS Server’s does not require a reboot · Issue #45557 · MicrosoftDocs/azure-docs · GitHub.
What to do after changing DNS?
After you change your DNS server on a Windows PC, you may need to flush your DNS cache to ensure Windows is using the records from your new DNS server and not cached results from your previous one.
How long does it take for DNS changes to take effect?
DNS propagation is the time frame it takes for DNS changes to be updated across the Internet. A change to a DNS record—for example, changing the IP address defined for a specific hostname—can take up to 72 hours to propagate worldwide, although it typically takes a few hours.
Will changing my DNS affect anything?
Although DNS is not directly related to your Internet speed, it can influence how fast an individual webpage appears on your computer. Once a connection has been established though, it should not affect download speeds. If you want to amend your router’s DNS servers however, this can help improve your overall speed.
