How to connect to a MYSQL in local machine from the Cloud?

[Anthony Cornejo]

[ Customer PC - MYSQL DB ] <--cloud--- [ Web App ]
[ Customer PC - MYSQL DB (master) ] <--cloud--- [ MYSQL DB (slave) | Web App ]

I have a mysql database that resides in a normal pc (windows 7), it's a database from an old application and I can't move it.

I need to communicate a web app (that resides in the cloud) with the database inside the "normal windows 7" that resides in a local lan with a private IP.

I was trying to do a MYSQL replication between the local database and a mysql slave, I do my test using virtual machine and it was working.

But when I try to replicate it, I realize that I can't do NAT between a normal windows and the public IP of my client and therefore I can't get the connection between the local MYSQL (master) and the Slave (Cloud) to get the replication.

Maybe there is something that I'm missing?