I'm on OS X 10.9, according to support.apple.com I can flush the cache with
sudo killall -HUP mDNSResponder
Unfortunately this does not really refresh my DNS cache at all, also not like this:
dscacheutil -flushcache; sudo killall -HUP mDNSResponder
$ dig www.example.com|grep CNAME www.example.com. 83955 IN CNAME example.com.
If cache were cleared it would be showing a number close to 86400, 3600, 300 or 60 are the TTL values offered by my domain name provider).
If I add
@dns-host to dig it works as expected:
$ dig @ns0.transip.net www.example.com|grep CNAME www.example.com. 60 IN CNAME GITHUBACCOUNT.github.io.
I also tried the other commands on that page. In the meantime I work around this by ssh'ing onto one of my servers and check things there. But I'd like a proper way to really refresh all DNS cache on my Mac. How can I do that?