Configuring Smart DNS

Procedure

1. Choose Network > DNS > Smart DNS.
2. Enable Smart DNS and click Apply.
3. In Smart DNS List, click Add.
4. Select either of the following configurations based on the scenario where one or multiple web servers are deployed on the enterprise intranet.
   • Select Single-server when only one web server is deployed on the enterprise intranet in Scenario.

     Parameter	Description
     Scenario	Select Single-server when only one web server is deployed on the enterprise intranet.
     Description	Enter the description of smart DNS.
     DNS Reply Address	Enter the public IP address of the intranet web server.
     Traffic Distribution Mode	Select Based on ISP egresses, Round Robin, or Weighted Round Robin as required
     ISP WAN Interface	Select the interface connected to ISP network.
     ISP Server Public Address	Enter the server address to be sent to ISP users.
     Weight	Set the weight for the public address of the ISP server. The FW allocates public addresses of ISP servers based on weights. This parameter is set only when Traffic Distribution Mode is set to Weighted Round Robin.

   • Select Multi-server when multiple web servers are deployed on the enterprise intranet in Scenario.

     Parameter	Description
     Scenario	Select Multi-server when multiple web servers are deployed on the enterprise intranet.
     Description	Enter the description of smart DNS.
     DNS Reply Address	Indicates the internet server address sent by the DNS server to users. The value is automatically generated on the basis of ISP Server Public Address in ISP WAN Interface Mapping List.
     Traffic Distribution Mode	Select Based on ISP egresses, Round Robin, or Weighted Round Robin as required
     ISP WAN Interface	Select the interface connecting the FW to ISP.
     ISP Server Public Address	Enter the public address of ISP server.
     Weight	Set the weight for the public address of the ISP server. The FW allocates public addresses of ISP servers based on weights. This parameter is set only when Traffic Distribution Mode is set to Weighted Round Robin.

5. Click OK.
6. Choose Policy > NAT Policy > Server Mapping.
7. In Server Mapping List, click Add.
8. In Add Address Mapping, configure server mapping.

   Parameter	Description
   Name	Enter the name of server mapping.
   Public IP Address	Enter ISP Server Public Address, namely, the server address sent to ISP users.
   Private IP Address	Enter DNS Reply Address, namely, the public IP address of the internet web server.

9. Click OK.
   

   If multiple ISP egresses and public ISP server addresses are configured, configure server mapping repeatedly to translate each public ISP server address into the DNS reply address.

10. Choose Network > Interface and configure sticky load balancing
    

    The sticky load balancing function can be configured only after the IP address and gateway address are set on the interface.