Some times we need to block access of some users out side our Office or Premise in such case we need to block by IP. If we block access of odoo on Internet no one can access it and it is useless so iP block is only secure and useful way to do it.
Add Allowed IP and related users directly from single view.
Allowed IP details on user form. In case if you want to give access to multiple IP from single place that can be done from here also.