Configuring ISP Routing and Geolocation Routing

Scenarios

If end users access a domain name, DNS servers return the same IP address to them regardless of their carriers or geographical locations. This would increase network latency and affect user experience.

With configurable resolution lines, you can specify different IP addresses for the same domain name based on the carriers or geographical locations of end users.

In addition to ISP and region lines, Huawei Cloud DNS allows you to customize resolution lines based on IP address ranges to route visitors to different web servers.

For a website deployed on multiple servers, you can set different weights for the record sets to balance the loads of these servers.

This best practice describes how to configure ISP routing and geolocation routing for different end users.

Cross-carrier access in the Chinese mainland: Configure a resolution line to return the most appropriate IP address used by each carrier to end users for nearby access.
Intelligent access around the globe: Configure a region line to return the corresponding IP address based on the geographical locations of end users to quickly respond to user requests.

Example Lines

Returning IP addresses based on users' carriers
- China Unicom: 1.1.xx.xx
- China Mobile: 2.2.xx.xx
- China Telecom: 3.3.xx.xx
- Other (such as CERNET, China Mobile Tietong, and Dr. Peng): 4.4.xx.xx
Returning IP addresses based on users' geographical locations (excluding Chinese mainland users)
- Hong Kong, China: 5.5.xx.xx
- Macao, China: 6.6.xx.xx
- Taiwan, China: 7.7.xx.xx
- Europe, North America, South America, Africa, Oceania, Antarctica, and Abroad: 8.8.xx.xx

Process Flow

Figure 1 shows the process of configuring ISP lines and region lines.

Figure 1 Process of configuring ISP lines and region lines
Click to enlarge

Step 1: Create a Public Zone

Create a public zone for your domain name, for example, huawei-example.com. For details, see Creating a Public Zone.

Step 2: Add Record Sets

Locate the created public zone and click Manage Record Sets in the Operation column.
The record set list is displayed.

Click Add Record Set to configure record sets for a subdomain (test.huawei-example.com) of the domain name.

ISP lines: Add record sets based on Table 1 to route visitors based on their carriers.

Figure 2 displays all the configured ISP lines.

**Table 1** ISP lines
Line Type	Carrier (IP Source of the Local DNS Egress of Visitors)	Record Set Value
ISP lines	China Unicom	1.1.xx.xx
	China Mobile	2.2.xx.xx
	China Telecom	3.3.xx.xx
Default	Other (such as CERNET, China Mobile Tietong, and Dr. Peng)	4.4.xx.xx

Figure 2 Record sets for ISP lines
Click to enlarge

Region lines: Add the record sets based on Table 2 to route visitors based on their locations.

Figure 3 displays all the configured region lines.

**Table 2** Region lines
Line Type	Geolocation (IP Source of the Local DNS Egress of Visitors)	Record Set Value
Asia Pacific	Hong Kong, China	5.5.xx.xx
	Macao, China	6.6.xx.xx
	Taiwan, China	7.7.xx.xx
Global-All regions	Other regions	8.8.xx.xx
North America-All regions
South America-All regions
Africa-All regions
Oceania-All regions
Antarctica-All regions
Abroad

Figure 3 Record sets for region lines
Click to enlarge

Step 3: Change the DNS Servers

The record sets you added in Step 2: Add Record Sets take effect only when Huawei Cloud DNS servers are used for domain name resolution.

For details, see How Do I View and Change the DNS Servers of a Domain Name?

Generally, the changes to DNS servers will take effect within 48 hours, but the time may vary depending on the domain name registrar's cache duration.