Replicating data over the Internet allows remote, disconnected users to access data when they need it using a connection to the Internet. Replicate data over the Internet using:

• A Virtual Private Network (VPN). For more information, see Publishing Data over the Internet Using VPN.
  
• The Web synchronization option for merge replication. For more information, see Web Synchronization for Merge Replication.
  

All types of Microsoft SQL Server replication can replicate data over a VPN, but you should consider Web synchronization if you are using merge replication.