Ensuring traffic goes out and comes in on the same NIC

I believe the system automatically replies using the same interface. However, if there is any problem or congestion with that interface, it will seek the next interface in the binding order to use.

The system uses an ordered list of access pathways known as binding. This is performed as follows:

1. Open Network and Dial-up Connections.

2. Click the connection you want to modify. On the Advanced menu, click Advanced Settings.

3. On the Provider Order tab in Network Providers, click the provider you want to move up or down in the list, and then click the up or down button.

Note: To modify the network provider order, you must be logged on as a member of the Administrators group.

Put the interface at the top of the list (i.e. use priority) that is used most often.