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Virtual IP

What is Virtual IP?

In bridged network environments, a virtual IP address (VIP) provides network services such as serving as an elastic IP address (EIP), port forwarding, load balancing, IPsec tunneling. When a VIP provides the preceding network services, packets are sent to the VIP and then routed to the destination network where VM instances are located.
  • VIPs created from a public network can provide network services such as EIP and load balancing for flat networks.
  • VIPs created from a public network can provide network services, such as EIP, port forwarding, load balancing, and IPsec tunnel, for VPC networks.
  • VIPs created from a VPC network can provide load balancing services for VPC networks.
  • VIPs created from a flat network can provide network services, such as EIP and load balancing, for flat networks.

You can use a VIP to provide performance-shared load balancing services. A performance-shared load balancer uses a VPC vRouter to provide load balancing services. Traffic is distributed to backend servers by the VPC vRouter. If the VPC vRouter is providing multiple services, the load balancing service shares the performance of the VPC vRouter along with other services.



Concepts

  • Public VIP: VIPs created from a public network. You can manually create a public VIP or use a public VIP automatically created after a VPC vRouter creation.
    • A public VIP can provide network services, such as EIP and load balancing, for flat networks. A public VIP can also provide network services, such as EIP, port forwarding, load balancing, and IPsec tunnel, for VPC networks.
    • You can use a public VIP to simultaneously provide port forwarding, load balancing, and IPsec tunnel services. You can also use a public VIP to provide one service for multiple VM instances. However, you cannot specify the same port number for different services.
    • A public VIP supports QoS, monitoring data, performance TOP 5, performance analysis, alarm, and other features.
  • VPC VIP: VIPs created from a VPC network. A VPC VIP can only be manually created.
    • A VPC VIP can provide load balancing services for VPC networks.
    • VPC VIPs do not support QoS, monitoring data, performance TOP 5, performance analysis, and alarm features.
  • Flat network VIP: VIPs created from a flat network. You can manually create a flat network VIP or use a flat network VIP automatically created after a VPC vRouter creation.
    • A flat network VIP provides network services, such as EIP and load balancing, for flat networks.
    • A flat network VIP supports QoS, monitoring data, performance TOP 5, performance analysis, alarm, and other features.
  • Custom VIP: manually created VIPs. You can customize a public VIP, VPC VIP, and flat network VIP based on your needs.
    • One custom public VIP can only be applied to one EIP instance.
    • Custom VIPs cannot be used across VPC vRouters.
    • When you use the EIP, port forwarding, load balancing, or IPsec tunnel services, you can select Create VIP to create a new VIP, or you can select Use Existing VIP to provide the services.
  • System VIP: VIPs automatically created by using the L3 network attached to VPC vRouters after the VPC vRouter creation. System VIPS can be categorized into public VIPs and flat network VIPs.
    • A system VIP belongs to only one VPC vRouter. When you attach a public network to a VPC vRouter, the Cloud will automatically create a system VIP. This VIP is the default IP address of the vRouter in the network.
    • By default, the system VIPs created from public networks are used to provide the source network address translation (SNAT) service.
    • When you use the EIP, port forwarding, load balancing, or IPsec tunnel service, you can select Use Existing VIP to provide the services.

Create a Virtual IP

On the main menu of ZStack Cloud, choose Resource Center > Network Service > Basic Network Service > VIP. On the VIP page, click Create VIP. Then, the Create VIP page is displayed.

On the displayed page, set the following parameters:
  • Name: Enter a name for the virtual IP address (VIP).
  • Description: Optional. Enter a description for the VIP.
  • Network: Select an L3 network that you created. The L3 network can be a public network, a flat network, or a VPC network.
    • VIPs created in a public network can provide EIP and load balancing services for flat networks.
    • VIPs created in a public network can provide EIP, port forwarding, load balancing, and IPsec tunnel network services for VPC networks.
    • VIPs created in a VPC network can provide load balancing services for VPC networks.
    • VIPs created in a flat network can provide EIP and load balancing services for flat networks. Currently, you cannot create a VIP with a flat network disabled with IP address management.
  • Network Range: Optional. Select a network range.
    Note:
    • If you selected an IPv4 public network, you can select a normal network range or an address pool. If you selected an IPv6 public network, you can only select a normal network range.
    • If you selected an IPv4 or IPv6 public network, you can only select a normal network range.
    • If you selected an IPv4 VPC network, you can only select a normal network range.
  • Assign IP: Optional. You can assign a virtual IP address.
    Note:
    • If left blank, the system automatically assigns a VIP.
    • If you do not select a network range, you can specify an IP address only from a normal network range.
  • VIP QoS: You can limit the network bandwidth of public VIPs and flat network VIPs. You can set the QoS for a custom VIP when you create the VIP or after the VIP is created.
    • Public Network VIP: Supports 3 options: Unlimited, Add QoS, and Bind Shared Bandwidth. Default: Unlimited.
      • Unlimited: Does not limit the VIP network bandwidth.
      • Add QoS: Adds a QoS for this VIP individually. Set the following parameters:
        • Port: Optional. Specify a port to set QoS rule for the port.
          Note:
          • Enter an integer that ranges from 1 to 65535.
          • If left blank, the QoS rule takes effect on ports from 1 to 65535.
        • Upstream Bandwidth: Optional. Set the upstream bandwidth for a VIP.
          Note:
          • Enter an integer. Unit: Kbps, Mbps, and Gbps.
          • If left blank, the upstream bandwidth is not limited.
        • Downstream Bandwidth: Optional. Set the downstream bandwidth for a VIP.
          Note:
          • Enter an integer. Unit: Kbps, Mbps, and Gbps.
          • If left blank, the downstream bandwidth is not limited.
      • Bind Shared Bandwidth: Binds the VIP to a shared bandwidth to make it share bandwidth resources and central speed limit with other VIPs.
    • Flat Network VIP: Supports 2 options: Unlimited and Add QoS. Default: Unlimited.
      • Unlimited: Does not limit the VIP network bandwidth.
      • Add QoS: Adds a QoS for this VIP individually. Set the following parameters:
        • Port: Optional. Specify a port to set QoS rule for the port.
          Note:
          • Enter an integer that ranges from 1 to 65535.
          • If left blank, the QoS rule takes effect on ports from 1 to 65535.
        • Upstream Bandwidth: Optional. Set the upstream bandwidth for a VIP.
          Note:
          • Enter an integer. Unit: Kbps, Mbps, and Gbps.
          • If left blank, the upstream bandwidth is not limited.
        • Downstream Bandwidth: Optional. Set the downstream bandwidth for a VIP.
          Note:
          • Enter an integer. Unit: Kbps, Mbps, and Gbps.
          • If left blank, the downstream bandwidth is not limited.
Figure 1. Create VIP


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