Force clear the local DNS cache of the system.

Jul 28, 2015#android #centos #ios #linux #macosx #windows #os71

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This article provides instructions for clearing the local DNS cache on various operating systems including Windows, Mac OS X, Linux, and Unix. It is necessary to clear the cache manually when it has been contaminated by GFW. The article provides specific commands for each operating system. For Android and iOS, the cache can be cleared by enabling airplane mode, changing the DNS, and then disabling the DNS.

When the local DNS cache is contaminated by GFW, it is necessary to manually force clear the local DNS cache. Usually, fixing the network connection is sufficient. It is also simple to handle it using command line. Below are the methods to force clear the local DNS cache in Windows/Mac OS/Linux/Unix environments.

In Windows environment, you can use the following command:

ipconfig /flushdns

In Mac OS X environment, usually you can use the following command:

sudo dscacheutil -flushcache

In Linux/Unix environment, depending on the system's DNS cache mechanism, if the system uses NSCD for DNS cache, you can use the following command:

sudo /etc/init.d/nscd restart

If the server or router uses DNSMASQ, you can use the following command:

sudo dnsmasq restart

Finally, for Android and iOS, you can refer to the above commands to solve the issue, but the following method is sufficient for clearing the cache:

Enable airplane mode -> Modify DNS -> Disable DNS