discoveryutil: command not found After connecting VPN, I often have to flush DNS to get my private hosts to be found. I would do this

sudo discoveryutil mdnsflushcache; sudo discoveryutil udnsflushcaches

Now, after upgrading to Yosemite 10.10.4, I get 

sudo: discoveryutil: command not found

So, discoveryutil is gone in 10.10.4? How can I flush DNS now?
Since discoveryutil was replaced by its predecessor mDNSResponder in 10.10.4 use sudo killall -HUP mDNSResponder again (like in Lion/Mountain Lion/Mavericks) to flush the DNS cache.