Reset Mac OS X dns Cache

OS X Yosemite 10.10

sudo discoveryutil mdnsflushcache
sudo discoveryutil udnsflushcaches

OS X Mountain Lion oder Lion
```
sudo killall -HUP mDNSResponder
```
Mac OS X 10.6
```
sudo dscacheutil -flushcache
```
Authors:
- Jochen Schnuerle