Synology SA3400 Virtual Machine Manager s White Paper - Page 16

Internal vSwitches, External vSwitches, and Link Aggregation Private vSwitch Synology NAS VMM Cluster External vSwitch Synology NAS VM 1 VM 2 VM 3 VM 1 VM 2 VM 3 Link Aggregation Group Switch vSwitch LAN port Figure 5: Virtual switches (vSwitches) can be configured to create an internal network between virtual machines, or they can be matched with LAN ports on your network interface card and connected to external networks. In the setup on the left, the three VMs can connect only to each other. On the right, one VM uses two LAN ports for better external connectivity (link aggregation), while two other VMs are conected to each other and to the network using only one LAN port and one external vSwitch 4. Network Connections A management network (connecting hypervisor and VMs) and cluster network (connecting hosts) are automatically created on VMM and do not need to be configured separately, as with certain other virtualization solutions. While you cannot manage these networks or disconnect your VMs, they are purely used to manage your machines and cluster. Virtual switches Each instance of VMM creates at least one virtual switch (vSwitch) on its host Synology NAS called "Default VM Network" and connected to all active physical LAN ports. You can edit this switch or create new vSwitches and attach these to one or several LAN ports. However, you do not need to connect VMs to any vSwitch if they do not require network access. An external vSwitch connects VMs to your LAN and the internet, using one or several of the physical LAN ports or logical network interfaces of your Synology NAS' network card. Machines connected to an external switch have direct access to your LAN and the internet using the host's connection. A private vSwitch connects VMs only with other VMs running on the same host, creating an internal host network similar to a local LAN. Network addresses Virtual machine IP addresses with LAN access are assigned like other IP addresses by your 14 Configuration Guide