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Connecting VPC1 and VPC-NAT to an Enterprise Router

Updated on 2025-01-23 GMT+08:00

This section describes how to connect VPC1 and VPC-NAT to an enterprise router.

Connecting VPC1 and VPC-NAT to an Enterprise Router

  1. Add VPC connections.

    For details, see Adding VPC Attachments to an Enterprise Router.
    NOTE:

    Two connections need to be added. Set their Attached Resource to VPC1 and VPC-NAT, respectively.

  2. Create two route tables.

    1. In the upper left corner, click and choose Networking > Enterprise Router. Click Manage Route Table.
    2. Create an association route table and a propagation route table, used for connecting to a protected VPC and a firewall, respectively.

      Click the Route Tables tab. Click Create Route Table. For more information, see Table 1.

      Table 1 Route table parameters

      Parameter

      Description

      Name

      Route table name.

      It must meet the following requirements:
      • Must contain 1 to 64 characters.
      • Can contain letters, digits, underscores (_), hyphens (-), and periods (.).

      Description

      Route table description

      Tag

      During the route table creation, you can tag the route table resources. Tags identify cloud resources for purposes of easy categorization and quick search.

      For details about tags, see Tag Overview.

  3. Configure the association route table.

    1. Create an association between VPC1 and VPC-NAT. On the route table configuration page, click the Associations tab and click Create Association. For more information, see Table 2.
      Table 2 Association parameters

      Parameter

      Description

      Attachment Type

      Select VPC.

      Attachment

      Select the VPC attachment from the Attachment drop-down list.

      NOTE:

      Two associations need to be added. Set their Attachment to VPC1 and VPC-NAT attachments, respectively.

    2. Add a static route to the firewall. Click the Routes tab and click Create Route. For more information, see Table 3.
      Figure 1 Creating a route
      Table 3 Route parameters

      Parameter

      Description

      Destination

      Set the destination address.

      • If 0.0.0.0/0 is configured, all the traffic of the VPC is protected by CFW.
      • If a CIDR block is configured, the traffic of the CIDR block is protected by CFW.

      Blackhole Route

      You are advised to disable this function. If it is enabled, the packets from a route that matches the destination address of the blackhole route will be discarded.

      Attachment Type

      Set Attachment Type to CFW instance.

      Next Hop

      Select the automatically generated firewall attachment cfw-er-auto-attach.

      Description

      (Optional) Description of a route.

  4. Configure the propagation route table.

    1. Add an association with the firewall. On the route table configuration page, click the Associations tab and click Create Association. For more information, see Table 4.
      Figure 2 Creating an association
      Table 4 Association parameters

      Parameter

      Description

      Attachment Type

      Set Attachment Type to CFW instance.

      Attachment

      Select the automatically generated firewall attachment cfw-er-auto-attach.

    2. Add a propagation with VPC1. Click the Propagations tab, and click Create Propagation. For more information, see Table 5.
      Figure 3 Creating a propagation
      Table 5 Propagation parameters

      Parameter

      Description

      Attachment Type

      Select VPC.

      Attachment

      Select the VPC1 attachment from the Attachment drop-down list.

    3. Add a static route to VPC-NAT. Click the Routes tab and click Create Route. For more information, see Table 6.
      Table 6 Route parameters

      Parameter

      Description

      Destination

      Set it to 0.0.0.0/0.

      Blackhole Route

      You are advised to disable this function. If it is enabled, the packets from a route that matches the destination address of the blackhole route will be discarded.

      Attachment Type

      Select VPC.

      Next Hop

      Select the VPC-NAT attachment from the drop-down list.

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