Which Security Group Rule Has Priority When Multiple Security Group Rules Conflict?

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Security group rules use the whitelist mechanism. If multiple security group rules conflict, the union of these rules takes effect.



Other related questions:
How Can I Configure Security Group Rules?

Security group rules consist of inbound and outbound rules.

When adding an inbound rule, you can set the source address to a security group or CIDR block. If you want to set the source address to a security group, you can only select security groups from the same VPC as the destination security group.

When adding an outbound rule, you can set the destination address to a security group or CIDR block. If you want to set the destination address to a security group, you can only select security groups from the same VPC as the source security group.

ECSs in security groups in different VPCs cannot communicate with one another. To allow them to communicate, bind EIPs to them and configure security group rules.


What Are the Functions of the Default Security Group Rule?

An inbound security group rule enables external access to ECSs in a security group, and an outbound security group rule enables ECSs in a security group to access external networks.

If no access rule is configured for a security group after an ECS is added to the security group, communication between the ECS and the external network is blocked.

The default inbound rule enables an ECS to be accessed by other ECSs in the same security group, and the default outbound rule enables ECSs in the security group to access external networks.

Security groups cannot resolve the problems caused by network faults or incorrect network configuration. For example, when two ECSs cannot communicate with each other due to a network problem, a security group rule will also not allow them to communicate.


How Can I Set a ServiceCenter Security Group Rule to Deny
【Product�? ManageOne ServiceCenter 【Version�? 3.0.9 【Question�? How can I set a ServiceCenter security group rule to deny? 【Answer�? A security group can only be configured with a whitelist (allowing access from a network segment) and cannot be denied (denying access from a network segment). ----End

Which Protocols Does a Security Group Support?

The protocol used by a security group can be set to TCP, UDP, ICMP, or ANY. ANY indicates that the security group takes effect for all protocols. If the TCP or UDP protocol is selected, configure ports 1 to 65535 for the protocols to access the security group. If the ICMP protocol is selected, you can set the ICMP protocol type. The default value is ANY.


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