About
A DNS cache is a cache of the result of a DNS lookup (query).
Resolver
The cache is implemented in a DNS library by the resolver.
You need to configure the resolver to configure or purge your cache.
Example: How to flush
Chrome
- Type in the address bar
chrome://net-internals/#dns
- and press the “Clear host cache” button.
Linux
To clear your local DNS cache, you have to type
ipconfig /flushdns
This is important when you try to troubleshoot a network problem because if a name is already cached it won't try and resolve the name again.