If you need each of your clients to have a dedicated VLAN to isolate their networks, you can enable the VLAN Per User mode. Follow these steps to configure this setting:
Navigate to the directory where Igiko is installed. This is typically found in Program Files\Igiko.
Locate and open the file named Igiko.exe.config using a text editor with administrative privileges.
Find the following line in the configuration file:
<add key="VlanPerUser" value="false" />
Change the value from false to true:
<add key="VlanPerUser" value="true" />
Save the changes and close the file.
After making this change, all new Igiko users will be automatically assigned unique VLAN numbers. So any virtual machines they create will have virtual network adapters configured with these VLANs.