How to clear DNS cache?

Question

My system is set to go directly to the OpenDNS name servers for DNS resolution. However, the results I get from "nslookup" differ from what I get if I query the same name server from another machine with the same resolv.conf settings.

That leads me to believe that DNS info is being cached locally somewhere. I don't have bind or nscd installed.

Where is this caching taking place and how can I clear/flush it?

Answer 1

I am assuming that you are using some of the linux variant and After a quick google it seems there is no "central" cache used anymore (previously nscd service maintained a central cache, but it is not installed by default atleast on fedora). If this is installed at you, you may want to restart the relevant service

nscd.x86_64 : A Name Service Caching Daemon (nscd).

also if-down/if-up may clear the app specific caches

Comments

If using nscd, restarting it does *not* clear its cache. You need to  do something like:
nscd --invalidate=hosts