I installed Packstack for Openstack allinone installation, and I'm now trying to add several compute nodes using different PCs.

According to http://openstack.redhat.com/Adding_a_compute_node, the additional Compute Nodes seems to connect with the PC what allinone has been installed by PackStack via a LAN; Data Network and Management Network described in the OpenStack Havana 3 node (Network Node, Compute Node, and Controller Node) setup guide look like sharing the LAN cable. 

Conceptually, two networks need to use different port. Do the additional Compute Nodes use a LAN as a trunk port to distinguish between the networks? Or could you explain how does the multiple connection in PackStack work?

Thanks in advance!

Byeong-Gi Kim