See https://www.rfc-editor.org/rfc/rfc6204.html https://www.rfc-editor.org/rfc/rfc6204.html and its update https://www.rfc-editor.org/rfc/rfc6204.html https://w

See https://www.rfc-editor.org/rfc/rfc6204.html https://www.rfc-editor.org/rfc/rfc6204.html and its update https://www.rfc-editor.org/rfc/rfc6204.html https://www.rfc-editor.org/rfc/rfc6204.html which were created because of the "NAT adds security" delusion. They address basic requirements for customer edge IPv6 routers, and some consumer devices are now following that.