Configuring Custom Lines
Scenarios
The public zone function provides you with more than 300 carrier and region resolution lines. You can also customize resolution lines based on specific IP address ranges. Usually, a DNS server returns the same IP address to all visitors, irrespective of where they come from. Custom line resolution returns a specific IP address based on the IP address of a visitor.
![](https://support.huaweicloud.com/eu/usermanual-dns/public_sys-resources/note_3.0-en-us.png)
- If the local DNS server of the broadband service provider used by the visitor does not support the Extension Mechanisms for DNS (EDNS), the authoritative DNS server checks whether the public IP address of the local DNS server matches the configured IP address range of the custom line.
- If the local DNS server of the broadband service provider used by the visitor supports EDNS, the authoritative DNS server checks whether the visitor's public IP address encapsulated in the EDN S matches the configured IP address range of the custom line.
You can configure custom resolution lines to obtain different resolution results based on source IP addresses of visitors.
If your website (example.com) is providing services both for external and internal users, you can configure different resolution lines so that the DNS server can return the external server address (1.1.1.1) to external users and internal server address (2.2.2.2) to internal users.
Add Custom Resolution Lines
- Go to the Custom Lines page.
- Click Add Custom Line.
- Configure the parameters based on Table 1.
Table 1 Parameters for adding a custom resolution line Parameter
Description
Value 1
Value 2
Line Name
Custom line name
Line 1
Line 2
IP Address Range
Source IP address range
Enter a range of 1 to 50 IP addresses and separate the start and end IP addresses with a hyphen (-).
1.0.0.1-1.0.0.2
1.0.0.3-1.0.0.4
- Click OK.
Add Record Sets with Custom Lines
For example, add record sets for example.com with Line 1 (to IP address 1.1.1.1) and Line 2 (to IP address 2.2.2.2).
- Go to the Public Zones page.
- On the Public Zones page, click the domain name (example.com) of the public zone.
The Record Sets page is displayed.
- Click Add Record Set.
The Add Record Set dialog box is displayed.
- Add two A record sets for example.com. Configure the parameters based on Table 2.
Table 2 Parameters for adding an A record set Parameter
Description
Line 1
Line 2
Name
Prefix of the domain name to be resolved.
For example, if the domain name is example.com, the prefix can be as follows:
- www: The domain name is www.example.com, which is usually used for a website.
- Left blank: The domain name is example.com.
The Name field cannot be set to an at sign (@). Just leave it blank.
- abc: The domain name is abc.example.com, a subdomain of example.com.
- mail: The domain name is mail.example.com, which is typically used for email servers.
- *: The domain name is *.example.com, which is a wildcard domain name, indicating all subdomains of example.com.
www
www
Type
Type of the record set
A – Map domains to IPv4 addresses
A – Map domains to IPv4 addresses
Line
The DNS server will return the IP address of the specific line, depending on where the visitors come from.
- Default: returns the default resolution result irrespective of where the visitors come from.
- ISP: returns the resolution result based on visitors' carrier networks. For details, see Configuring ISP Lines.
- Region: returns the resolution result based on visitors' geographical locations. For details, see Configuring Region Lines.
Resolution Lines_Line1
Resolution Lines_Line2
TTL (s)
Cache duration of the record set on a local DNS server, in seconds.
The value ranges from 1 to 2147483647, and the default is 300.
If your service address changes frequently, set TTL to a smaller value.
Default value: 300
Default value: 300
Value
IPv4 addresses mapped to the domain name
Enter each IPv4 address on a separate line.
1.1.1.1
2.2.2.2
Weight
(Optional) Weight of a record set. The value ranges from 0 to 1000, and the default value is 1.
This parameter is only designated for public domain names.
If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.
1
1
Tag
(Optional) Identifier of a record set. Each tag contains a key and a value. You can add a maximum of 10 tags to a record set.
For details about tag key and value requirements, see Table 3.
example_key1
example_value1
example_key1
example_value1
Description
(Optional) Supplementary information about the record set.
You can enter a maximum of 255 characters.
N/A
N/A
Table 3 Tag key and value requirements Parameter
Requirements
Example Value
Key
- Cannot be left blank.
- Must be unique for each resource.
- Can contain a maximum of 36 characters.
- Cannot start or end with a space nor contain special characters =*<>\,|/
example_key1
Value
- Cannot be left blank.
- Can contain a maximum of 43 characters.
- Cannot start or end with a space nor contain special characters =*<>\,|/
example_value1
- Click OK.
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