Use case 7: Configure load balancing in DSR mode by using IP Over IP 编辑

You can configure a Citrix ADC appliance to use direct server return (DSR) mode across Layer 3 networks by using IP tunneling, also called IP over IP configuration. As with standard load balancing configurations for DSR mode, this allows servers to respond to clients directly instead of using a return path through the Citrix ADC appliance. This improves response time and throughput. As with standard DSR mode, the Citrix ADC appliance monitors the servers and performs health checks on the application ports.

With IP over IP configuration, the Citrix ADC appliance and the servers do not need to be on the same Layer 2 subnet. Instead, the Citrix ADC appliance encapsulates the packets before sending them to the destination server. After the destination server receives the packets, it decapsulates the packets, and then sends its responses directly to the client. This is often referred to as L3DSR.

To configure L3-DSR mode on your Citrix ADC appliance:

• Create a load balancing virtual server. Set the mode to IPTUNNEL and enable sessionless tracking.
• Create services. Create a service for each back-end application and bind the services to the virtual server.
• Configure for decapsulation. Configure either a Citrix ADC appliance or a back-end server to act as a decapsulator.

  Note:

  When you use a Citrix ADC appliance, the decapsulation setup is an IP tunnel between the ADC appliances with the back end doing L2DSR to the real servers.

Configure a load balancing virtual server

Configure a virtual server to handle requests to your applications. Assign the service type that matches the service, or use a type of ANY for multiple services. Set the forwarding method to IPTUNNEL and enable the virtual server to operate in sessionless mode. Configure any load balancing method that you want to use.

To create and configure a load balancing virtual server for IP over IP DSR by using the command line interface

At the command prompt type the following command to configure a load balancing virtual server for IP over IP DSR and verify the configuration:

add lb vserver <name> serviceType <serviceType> IPAddress <ip> Port <port> -lbMethod <method> -m <ipTunnelTag> -sessionless [ENABLED | DISABLED]

show lb vserver <name>
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