Connect locacl sqlserver through net

Question

Hi,
My Sqlserver in on a local windows 2003server which is
connected in Lan and
internet connection is through
Router
And i have to access its Database through internet or
Remote connection.
Suppose my internet provider ip address is 192.178.12.101
and
My local windows server 2003 lan ip address is
192.148.1.86
 
So what will be my connection string

Thanking You
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