Same issue for me
$ docker pull hello
Using default tag: latest
Error response from daemon: Get https://registry-1.docker.io/v2/library/hello/manifests/latest: Get https://auth.docker.io/token?scope=repository%3Alibrary%2Fhello%3Apull&service=registry.docker.io: dial tcp: lookup auth.docker.io on 192.168.65.1:53: dial tcp 192.168.65.1:53: getsockopt: connection refused
Docker for Mac: version: mac-v1.12.0-beta17
OS X: version 10.11.5 (build: 15F34)