Example of Configuring LLB

This section describes an inbound LLB configuration example.

Ethernet0/6 and ethernet0/7 are connected to telecom and netcom links respectively. With inbound LLB enabled, the device will return the IP address defined in the ISP static address named telecom after receiving a DNS request from netcom users, and will return the IP address defined in the ISP static address named telecom after receiving a DNS request from telecom users. The network topology is shown as below:

Take the following steps:

Step 1: Configure ISP information:

  1. On the Navigation pane, click Configure > Network > Routing to visit the Routing page.
  2. On the ISP Profile tab, click New.
  3. In the ISP Configuration dialog, configure options as below:
  4. Click Add to add the subnet to the ISP profile. The subnet will be displayed in the ISP subnet list below.
  5. Click OK to save your settings.
  6. Repeat Step 2 to Step 5 to create another ISP profile:

Step 2: Enable SmartDNS and configure a SmartDNS rule table:

  1. On the Navigation pane, click Configure > Network > LLB to visit the LLB page.
  2. Click the Inbound tab.
  3. In the Inbound LLB page, click Enable SmartDNS to enable SmartDNS (skip this step if SmartDNS is already enabled).
  4. Click New on the upper-left.
  5. In the Domain Configuration dialog, configure options as below:
  6. Click Add to add the configured SmartDNS rule to the rule table.
  7. Repeat Step 4 to Step 5 to create another SmartDNS rule:
  8. Click OK to save your settings.

When PC1 requests www.test.com, the device will return the IP address for telecom link 100.1.1.2; when PC2 requests www.test.com, the device will return the IP address for netcom link 200.1.1.2.