README.md

DNS Ops

by Mike Holzinger

DNS utility commands for OS X machines.

Help

dns_ops.sh -h

usage: dns_ops.sh [-a auto] [-d dyndns] [-g google] [-h help] [-o opendns] [-p print] [-r reset]
  This utility sets [Wi-Fi] DNS entries to DynDNS, Google, OpenDNS or DHCP host (auto)
  eg: dnsops.sh -g   <--- sets the Wi-Fi interface to use Google DNS

Print current DNS entry info

dns_ops.sh -p

Current DNS server entries on this Mac :
208.67.222.222 208.67.220.220

Set DNS to Automatic

Set interface [Wi-Fi] to AUTO from DHCP server. This is recommended if unable to authenticate to a proxied Public Access-Point which needs client behavior acceptance.

dns_ops.sh -a

Assign DNS to CloudFlare DNS entries

dns_ops.sh -c

Setting [Wi-Fi] interface to Cloudflare DNS
New entries : 1.1.1.1 1.0.0.1

Assign DNS to DynDNS entries

dns_ops.sh -d

Setting [Wi-Fi] interface to DynDNS
New entries : 216.146.35.35 216.146.36.36

Assign DNS to Google DNS entries

dns_ops.sh -g

Setting [Wi-Fi] interface to Google DNS
New entries : 8.8.8.8 8.8.4.4

Assign DNS to OpenDNS entries

dns_ops.sh -o

eg: Setting [Wi-Fi] interface to OpenDNS
New entries : 208.67.222.222 208.67.220.220

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Reset DNS cache

Reset DNS cache. This command test for OS X Minor revision level and executes the appropriate reset statement.

dns_ops.sh -r

Lion though current [ 10.9 < 10.7 ]

Resetting DNS Cache
Stopping mDNSResponder...
DNS cache successfully reset

Loepard and Snow Leopard [ 10.6 < 10.5 ]

Resetting DNS Cache
Exec dscacheutil -flushcache...
DNS cache successfully reset.

Tiger and earlier releases [ 10.4 < 10.1 ]

Resetting DNS Cache
Exec lookupd -flushcache...
DNS cache successfully reset.