How to narrow list of valid IP addresses for QNAP NAS access, two factor authentication

https://www.phy2vir.com/restricting-access-to-qnap-nas-by-country/

Setting up two factor auth

https://www.qnap.com/en-us/how-to/knowledge-base/article/setting-up-the-2-step-verification-to-login-in-nas