MySQL 5.1 Reference Manual :: 5.1.2 Server Command Options see "bind-address"

Step By Step Manual

Mysql:

GRANT ALL ON <database-name>.* TO <database-user>@'<ip-address or server-name>' IDENTIFIED BY '<password>';

Use your providers IP if you have an 192.168.*.*, for example:

dslc-082-082-169-101.pools.arcor-ip.net

You will see your provider's IP as error like "Host dslc-082-082-169-101.pools.arcor-ip.net cannot connect to this MySQL Server" or so when you try to connect.