Allowing Outbound Traffic from Cloud Resources Only to a Specified Domain Name

Application Scenarios

To prevent sensitive data leakage or external attacks, you need to restrict the Internet domain names that can be accessed by cloud resources.

Use CFW to implement refined management and control on cloud resources and allow access traffic from all EIPs to a specified domain name. (Wildcard domain name *.example.com is used as an example).

Configuring CFW to Allow Cloud Resources to Access a Specified Domain Name

1. Purchase the CFW standard or professional edition. For details, see Purchasing CFW.
2. (Optional) Switch to another firewall instance: Select a firewall from the drop-down list in the upper left corner of the CFW console.
3. Enable protection for an EIP.
   1. In the navigation pane, choose Assets > EIPs. The EIPs page is displayed. The EIP information is automatically updated to the list.
   2. In the row of the EIP, click Enable Protection in the Operation column.

4. Configure protection rules.
   1. In the navigation pane, choose Access Control > Internet Border Protection Rules.
   2. On the Protection Rules > EIP tab page, click Add Rule. On the Add Rule page, configure protection information and set other parameters as needed.
      Configure the following protection rules:

      • One of the rule blocks all traffic. The priority is the lowest.

        Table 1 Blocking all traffic

        Parameter	Example Value	Description
        Direction	Inbound	Direction of the protected traffic.
        Source	Any	Origin of network traffic.
        Destination	Any	Receiver of network traffic.
        Service	Any	Protocol, source port, and destination port of network traffic.
        Application	Any	Protection policy for application layer protocols.
        Action	Block	Action taken when traffic passes through the firewall.

      • The other rule allows the access traffic to *.example.com and has the highest priority.

        Table 2 Allowing the access traffic to a domain name

        Parameter	Example Value	Description
        Direction	Outbound	Direction of the protected traffic.
        Source	Any	Origin of network traffic.
        Destination	Select Domain name/domain group and then Application. Select Domain name from the drop-down list and enter *.example.com.	Receiver of network traffic.
        Service	TCP/1-65535/1-65535	Protocol, source port, and destination port of network traffic.
        Application	HTTP and HTTPS	Protection policy for application layer protocols.
        Action	Allow	Action taken when traffic passes through the firewall.

5. View the rule hits in access control logs.

   In the navigation pane, choose Log Audit > Log Query. The Attack Event Logs tab page is displayed by default. Click the Access Control Logs tab. The Internet Border Firewall page is displayed by default.

   

   In the rows where Destination IP is a domain name matching example.com, the corresponding Action is Allow. For other traffic, the Action is Block.

References

• For details about how to configure a domain name group, see .
• For details about how to add other protection rules, see the parameter description in Adding a Protection Rule.