What Are the Functions of the Default Security Group Rule?

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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.



Other related questions:
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.


What Is a Security Group?

A security group implements access control for ECSs within a security group and between different security groups. After a security group is created, you can create different access rules for the security group to protect the ECSs that are added to this security group.


What is IAD's default reading group and writing group
IAD default read group and write groups are as follows, the relevant parameters can be modified in the advanced configuration >eSight configuration of the IAD web interface Reading group:Public@123 Writing group:Private@123 Trap group:Public@123

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

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


Can I Change the Security Group to Which an ECS Belongs?

Yes. Log in to the ECS console, switch to the page showing ECS details, and change the security group to which the ECS belongs.


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