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RevkovStanislav-4638 avatar image
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RevkovStanislav-4638 asked ·

How often may I clear DNS cache with running ipconfig /flushdns command?

Please advise me how often I may run ipconfig /flushdns without risks?

I have a need to clear DNS cache every 15 minutes and I am going to schedule it the operating system scheduler.

windows-dhcp-dns
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Hi,

Just checking in to see if the information provided was helpful.

If yes, you may accept useful reply as answer, if not, welcome to feedback.

Best Regards,
Sunny

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SunnyQi-MSFT avatar image
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SunnyQi-MSFT answered ·

Hi,

Thanks for posting in Q&A platform.

DNS records have a Time To Live (TTL) value associated with them which tells a DNS cache how long the particular record is good for. Records in the cache are kept for their TTL, then re-queried. The TTL was defined in SOA record of specific zone in DNS server. If you need clear DNS cache from client side for every 15 minutes, it is OK. After these caches were cleared, if needed, the client will re-query these records from DNS server.

On a Windows machine you can see a list of all the records in your cache along with their TTL by executing the following command at the command prompt:

ipconfig /displaydns

TTL times are always represented in seconds.

You can force a flush of all cached DNS records using the following command:

ipconfig /flushdns

Best Regards,
Sunny


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DSPatrick avatar image
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DSPatrick answered ·

Should not be a problem. The effects would be constrained to the desktop you run the command on.

--please don't forget to Accept as answer if the reply is helpful--





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RevkovStanislav-4638 avatar image
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RevkovStanislav-4638 answered ·

Thank you all!

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You're welcome~

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