Astrill Setup Manual:How to flush DNS cache on Linux
		
		
		
		
		
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In ubuntu if you want to flush DNS cache you need to restart nscd daemon
Install nscd using the following command
sudo aptitude install nscd
Flush DNS Cache in Ubuntu Using the following command
sudo /etc/init.d/nscd restart
http://www.ubuntugeek.com/howto-clearflush-dns-cache-in-ubuntu.html