First open Network Preferences which could be found under your internet connections.

Image RemovedOpen Network Preferences through: Applications > System Preferences > Network

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Disabling IPv6 on macOS

To disable IPv6 on your machine with the following commands in Terminal (Accessible through /Applications/Terminal.app)

To Get List of Hardware

networksetup -listallnetworkservices

...

Note: Change "Interface_Name" to the name of the desired interface you wish to disable. (NOT case sensitive)

Enabling IPv6 on macOS

Enable IPv6 on your machine with the following commands in Terminal (Accessible through /Applications/Terminal.app)

To Enable IPv6 on Desired Interface

...

Note: Change "Interface_Name" to the name of the desired interface you wish to enable. (NOT case sensitive)

This has been tested to work on v10.12 and v10.13