You can disable IPv6 on more recent releases of OS X by running a command in the Terminal application.
1. Click in the upper-right corner of the menu bar, or press Command-Space bar.
2. Type in 'Terminal' and double-click the item.
3. Execute the following command in the terminal window :
sudo networksetup -listallnetworkservices
4. You will find here a list of all your network interfaces and their descriptions.
Locate the network interface you are currently using, typically Ethernet or Wi-Fi. Now use the following command in the terminal window to disable IPv6 on that interface. Please note that you may need to use quotation marks to include the interface name.
sudo networksetup -setv6off Ethernet
sudo networksetup -setv6off Wi-Fi
5. Then you will be invited to enter your OS X administrator password. Afterwards, IPv6 will be deactivated.
If you want to re-enable IPv6 on your device, you can simply execute this command in the terminal :
sudo networksetup -setv6automatic Wi-Fi
sudo networksetup -setv6automatic Ethernet
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