# The Method of Optimizing DNS Configuration

## Step 1 Configure Redundant DNS Server Addresses

This can prevent the situation where the domain cannot be resolved after the single point of failure of DNS Server.

In the system, choose control panel -> Network and Sharing Center ->
Choose the current network connection (such as Ethernet 2) -> Properies -> Double-click Internet Protocol Version 4 (TCP/IPv4)

In the Perferred DNS Server and Alternate DNS Server, configure two IPs from the table below according to the data center.

| Data Center/Availability Zone | IP                       |
| ----------------------------- | ------------------------ |
| Beijing Zone 2 B                | 10.9.255.1，10.9.255.2   |
| Beijing Zone 2 C                | 10.10.255.1，10.10.255.2 |
| Beijing Zone 2 D                | 10.19.255.1，10.19.255.2 |
| Beijing Zone 2 E                | 10.42.255.1，10.42.255.2 |
| Ulanqab Zone A                | 100.65.128.2，100.65.128.3 |
| Guangdong Zone B              | 10.13.255.1，10.13.255.2 |
| Hong Kong Zone A and B        | 10.8.255.1，10.8.255.2   |
| US(Los Angeles) Zone A            | 10.11.255.1，10.11.255.2 |
| Singapore Zone B              | 10.35.224.212，10.35.250.52 |
| Singapore Zone A              | 10.35.255.1，10.35.255.2 |
| TH(Bangkok) Zone A                | 10.31.255.1，10.31.255.2 |
| US(Washington) Zone A             | 10.27.255.1，10.27.255.2 |
| DE(Frankfurt) Zone A              | 10.29.255.1，10.29.255.2 |
| KR(Seoul) Zone A                  | 10.33.255.1，10.33.255.2 |
| RU(Moscow) Zone A                 | 10.39.255.1，10.39.255.2 |
| JP(Tokyo) Zone A                  | 10.40.255.1，10.40.255.2 |
| TW(Taipei) Zone A                 | 10.41.255.1，10.41.255.2 |
| AE(Dubai) Zone A                  | 10.44.255.1，10.44.255.2 |
| ID(Jakarta) Zone A                | 10.45.255.1，10.45.255.2 |
| IN(Mumbai) Zone A                 | 10.47.255.1，10.47.255.2 |
| BR(Sao Paulo) Zone A              | 10.49.255.1，10.49.255.2 |
| GB(London) Zone A                 | 10.50.255.1，10.50.255.2 |
| PH(Manila) Zone A                 | 100.64.48.2，100.64.48.3 |
| TH(Bangkok) Zone B                | 10.31.255.11，10.31.255.10 |
| NG(Lagos) Zone A                  | 10.52.255.1，10.52.255.2 |
| Ho Chi Minh Zone A            | 100.64.0.2，100.64.0.3 |
| East China(Shanghai2) Zone B               | 10.23.255.1，10.23.255.2 |

## Step 2 Enable NSCD service

In Windows, no extra configuration is necessary as local DNS cache is enabled by default.