If I do SHOW GRANTS in my mysql database I get
GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' 
    IDENTIFIED BY PASSWORD 'some_characters' 
    WITH GRANT OPTION
If I am not mistaken, root@localhost means that user root can access the server only from localhost. 
How do I tell MySQL to grant root the permission to access this mysql server from every other machine (in the same network), too?