Rascals are always sociable, and the chief sign that a man has any nobility in his character is the little pleasure he takes in others company. Arthur Schopenhauer

Quick tip if you want IPv6 off on macOS 12 Monterey, since Apple disabled the Off option from the Configure IPv6 toggle, for my own safety, of course:

On WiFi:

$ networksetup -setv6off Wi-Fi

On Ethernet:

$ networksetup -setv6off Ethernet