Scenario

Multiple VPCs are created on the cloud, for example, the financial system and the human resource management system correspond to the VPCs of two different business departments. To meet the requirements of mutual access and sharing of internal services between business systems and to ensure communication security, Intranet DNS is used to implement domain resolution and mutual access. Using intranet domain names for mutual access helps establish a secure and reliable communication channel. It also simplifies inter-VPC configuration and management, enabling mutual access between the financial system and the human resource management system.

Solutions

You can easily set up an intranet DNS to connect multiple VPCs, allowing them to access each other through easily remembered domain names instead of IP addresses.

Create a VPC peering connection and configure routing.
Create an intranet DNS and associate it with VPCs.
Add record sets and add host records.
Configure the intranet DNS.

The following table describes the relevant parameters.

	VPC Name	VPC CIDR Block	DNS
Local VPC	vpc-hr	192.168.0.0/16	100.95.0.1
Peering VPC	vpc-finace	10.0.0.0/8	100.95.0.1

Procedure

Log in to the Intranet DNS console.
Click at the top of the page, and select a region. In this case, select Huadong1.
On the Virtual Private Cloud page, create two VPCs, which are the financial system VPC (vpc-finance) and the human resource management system VPC (vpc-hr).
On the VPC Peering Connection page, create a VPC peering connection between the two VPCs, as shown in the following figure.
In the VPC peering connection list, click the name of the VPC peering connection you created, which is hr-finance .
On the Local Route tab, click Routing Table to configure the route from hr to finance .

After the route is created, you can view the route information on the Local Route tab.
On the Peering Route tab, click Routing Table to configure the route from finance to hr .

After the route is created, you can view the route information on the Peering Route tab.
Navigate to the Intranet DNS page, create an intranet DNS, and associate it with the two VPCs (vpc-hr and vpc-finance ).
In the Operationcolumn of the target domain name, click Manage Record Sets

to add record sets.

Add a host record for vpc-hr .

Add a host record for vpc-finance .

After the host records are added, you can view the DNS records on the Parse Records page.

Set the DNS service addresses of the vpc-hr host and the vpc-finance host to the intranet DNS address. For more information, see Modifying the Host DNS to Make the Intranet DNS Configuration Take Effect.
Run the ping command to test whether the vpc-finance host can access the vpc-hr host through the intranet domain name.