www.forum.com/login will show login modal only when login required is disabled.
If the forum is not public (i.e. login required is enabled) then www.forum.com/login will always show login page.
www.forum.com/login will show login modal only when login required is disabled.
If the forum is not public (i.e. login required is enabled) then www.forum.com/login will always show login page.