If you have multiple NICs for a source workload, you must specify which NIC to use for replication.
To enable a NIC for Replication:
In the Web Interface, select Planning in the toolbar, then select the Workloads tab.
Use the Filter and Advanced Search options to locate the workload of interest.
Double-click the workload you want to modify to open its Workload dialog. You can alternatively select the workload, and then click Edit.
Scroll down to view the Network Interfaces panel and locate the NIC you want to use for replication.
Under the Source workload, click Enable to set Use for Replication to Yes. At least one source NIC must be enabled.
Click Close.