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Linux - Networking This forum is for any issue related to networks or networking.
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Old 02-12-2017, 06:05 PM   #1
grumpyskeptic
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How to flush the DNS cache?


I am using Linux Mint 17.3 Rosa Cinnamon.

Is shutting down and turning off the computer and the modem-router, and then turning them back on again, always sufficient to flush the DNS cache?

If not, what do I need to do please? The instructions I have found on the internet vary considerably according to the particular variety of Linux used, and there seems to be several lines of terminal code to enter.

Thanks.
 
Old 02-12-2017, 10:10 PM   #2
resuni
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If your problem is with DNS not updating, it's almost always a problem with your upstream DNS server. You can view the name servers you are using with:

Code:
nmcli device show <interfacename>
Obviously replace <interfacename> with your actual interface name. If you don't know the name of your network interface, paste the output of
Code:
sudo ifconfig
here and we can show you how to find it.

If it lists the name server as the same IP address as your router, then you likely have some DNS caching going on on your router. Restarting it will likely flush its cache. Certain routers are notorious for caching DNS records for an obscene amount of time, so if your network is currently set up like this, I recommend changing your router's DHCP options to distribute OpenDNS or Google DNS name servers. Doing this, you can avoid many problems caused by DNS caching.
 
Old 02-13-2017, 02:27 AM   #3
ondoho
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i have nothing to say on the topic (yet) but i remember that op has been posting about dns servers:
https://www.linuxquestions.org/quest...949/page2.html
https://www.linuxquestions.org/quest...rs-4175598472/
i think this might help to assess the current situation.
 
  


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