Using both Lan port on Intel I210-AT, one in the switch and the other in the Streamer

[agent_kith]

I know that configuration can work, because I based my server on a well know server using the same Motherboard.

Hi Bob, to do what you want, you can either:

1. Use the "full stack" kernel and enable bridging. This will bridge the two network cards together as one. In this setup you only set the IP on the bridged interface (usually called bond0).
   
2. Use a different subnet on the two network interfaces. 192.168.1.x on the switch side, and 192.168.2.x on the other.
   
3. Use VLANs and route between the VLANs. This is the only way to properly seggegrate traffic.
   

With #1. Bridging technically is no different from connecting the streamer to a switch. You're using a good Intel NIC so the performance will  be similiar to a switch, but on other network chipsets (e.g. broadcom) it will be worse.

For most use cases, I would recommend #2. Have a look at this thread, it will have snippets of infomation you need to set this up.

Currently I'm doing #3.