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For the most up-to-date list of supported network services, see the &PRODUCT; UI or call listNetworkServices. A network offering is a named set of network services, such as: DHCP DNS Source NAT Static NAT Port Forwarding Load Balancing Firewall VPN (Optional) Name one of several available providers to use for a given service, such as Juniper for the firewall (Optional) Network tag to specify which physical network to use When creating a new VM, the user chooses one of the available network offerings, and that determines which network services the VM can use. The &PRODUCT; administrator can create any number of custom network offerings, in addition to the default network offerings provided by &PRODUCT;. By creating multiple custom network offerings, you can set up your cloud to offer different classes of service on a single multi-tenant physical network. For example, while the underlying physical wiring may be the same for two tenants, tenant A may only need simple firewall protection for their website, while tenant B may be running a web server farm and require a scalable firewall solution, load balancing solution, and alternate networks for accessing the database backend. If you create load balancing rules while using a network service offering that includes an external load balancer device such as NetScaler, and later change the network service offering to one that uses the &PRODUCT; virtual router, you must create a firewall rule on the virtual router for each of your existing load balancing rules so that they continue to function. When creating a new virtual network, the &PRODUCT; administrator chooses which network offering to enable for that network. Each virtual network is associated with one network offering. A virtual network can be upgraded or downgraded by changing its associated network offering. If you do this, be sure to reprogram the physical network to match. &PRODUCT; also has internal network offerings for use by &PRODUCT; system VMs. These network offerings are not visible to users but can be modified by administrators.