Unfuck your Mac's networking after using VPN, changing WIFI, etc.

unfuck_mavericks.sh

#!/bin/bash

sudo networksetup -setv4off Wi-Fi
sleep 1
sudo networksetup -setv6off Wi-Fi
sleep 1
sudo networksetup -setdhcp Wi-Fi
sleep 1
sudo networksetup -setv6automatic Wi-Fi
sleep 1

# Clear DNS
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
sleep 1
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

unfuck_yosemite.sh

#!/bin/sh

IFS=$'\n'
for i in `networksetup -listallhardwareports | awk -F": " '/Hardware Port/ { print $2 }'`; do
    echo "Fix $i"
    networksetup -setv4off $i > /dev/null 2>&1
    if [ "$?" = "0" ]; then
        sleep 1
        networksetup -setdhcp $i
    fi
done