title: Multi-homed SQL Server with High Availability Groups
body: <p>We have two servers (SQL-ATL01, SQL-ATL02) that make up a Failover Cluster, each running as part of a  SQL Server High Availability Group (HAG). Each server has two network cards. One is a 10Gbit card that is directly connected to the other server and is used for Synchronizing the HAG on a 192.168.99.x subnet. The other is a 1Gbit card that is used to connect the DB servers to a switch to communicate with the application servers on a 10.0.0.x subnet. The Listener is pointed to the  192.168.99.x subnet.</p>
  
  <p>We want to add a third server (SQL-NYC01) in another physical location to the cluster and run it as an Async replica part of the HAG, but the VPN only routes traffic on the subnet on the 1Gbit network.</p>
  
  <p>Is there any way to set up the Failover Cluster and High Availability Group to tell it:</p>
  
  <ul>
  <li>Send synchronous replica traffic for SQL-ATL01 &lt;--> SQL-ATL02 over 192.168.99.x</li>
  <li>Send asynchronous replica traffic for (SQL-ATL01, SQL-ATL02) &lt;--> SQL-NYC01 over 10.0.0.x</li>
  </ul>
  
  <p>Or do we <em>have</em> to have <em>all</em> replica traffic going in and out on the same IP address/subnet?  </p>