Step 5: Add a Security Group Rule

Scenarios

After you create a security group, you can add rules to the security group. A rule applies either to inbound traffic or outbound traffic. After you add cloud resources to the security group, they are protected by the rules of the group.

• Inbound rules control incoming traffic to cloud resources in the security group.
• Outbound rules control outgoing traffic from cloud resources in the security group.

Procedure

1. In the navigation pane on the left, choose Access Control > Security Groups.
2. On the Security Groups page, locate the target security group and click Manage Rule in the Operation column to switch to the page for managing inbound and outbound rules.
3. On the Inbound Rules tab, click Add Rule. In the displayed dialog box, set required parameters.

   You can click + to add more inbound rules.

   Table 1 Inbound rule parameter description

   Parameter	Description	Example Value
   Protocol & Port	Protocol: The network protocol. Currently, the value can be All, TCP, UDP, ICMP, GRE, or others.	Custom TC
   	Port: The port or port range over which the traffic can reach your ECS. The value ranges from 1 to 65535.	22, or 22-30
   Type	The IP address type. IPv4 IPv6	IPv4
   Source	The source of the security group rule. The value can be a single IP address or a security group to allow access from the IP address or instances in the security group. For example: Single IP address: 192.168.10.10/32 (IPv4); 2002:50::44/127 (IPv6) IP address range: 192.168.1.0/24 (IPv4); 2407:c080:802:469::/64 (IPv6) All IP addresses: 0.0.0.0/0 (IPv4); ::/0 (IPv6) Security group: sg-abc	0.0.0.0/0
   Description	Supplementary information about the security group rule. This parameter is optional. The security group rule description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).	-

4. On the Outbound Rules tab, click Add Rule. In the displayed dialog box, set required parameters.

   You can click + to add more outbound rules.

   Table 2 Outbound rule parameter description

   Parameter	Description	Example Value
   Protocol & Port	Protocol: The network protocol. Currently, the value can be All, TCP, UDP, ICMP, GRE, or others.	Custom TCP
   	Port: The port or port range over which the traffic can leave your ECS. The value ranges from 1 to 65535.	22, or 22-30
   Type	The IP address type. IPv4 IPv6	IPv4
   Destination	The destination of the security group rule. The value can be a single IP address or a security group to allow access to the IP address or instances in the security group. For example: Single IP address: 192.168.10.10/32 (IPv4); 2002:50::44/127 (IPv6) IP address range: 192.168.1.0/24 (IPv4); 2407:c080:802:469::/64 (IPv6) All IP addresses: 0.0.0.0/0 (IPv4); ::/0 (IPv6) Security group: sg-abc For more information, see Virtual Private Cloud User Guide.	0.0.0.0/0
   Description	Supplementary information about the security group rule. This parameter is optional. The security group rule description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).	-

5. Click OK.