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Security Group Configuration Examples

Updated on 2022-02-22 GMT+08:00

Case 1: BMSs in Different Security Groups Need to Communicate with Each Other Through an Internal Network

  • Scenario

    Resources on a BMS in a security group need to be copied to a BMS in another security group. The two BMSs are in the same VPC. Then, you can enable internal network communication between the two BMSs and copy resources.

  • Security group configuration

    In the same VPC, BMSs associated with the same security group can communicate with one another by default, and no additional configuration is required. However, BMSs in different security groups cannot communicate with each other by default. You must add security group rules to enable the BMSs to communicate with each other through an internal network.

    However, BMSs in different security groups cannot communicate with each other by default. You must add security group rules to enable the BMSs to communicate with each other through an internal network.

    Protocol

    Direction

    Port Range/ICMP Protocol Type

    Source

    Protocol to be used for internal network communication. Supported values are TCP, UDP, ICMP, and All.

    Inbound

    Port number range or ICMP protocol type

    IPv4 address, IPv4 CIDR block, or another security group ID

Case 2: Only Specified IP Addresses Can Remotely Access BMSs in a Security Group

  • Scenario

    To prevent BMSs from being attacked, you can change the port number for remote login and configure security group rules that allow only specified IP addresses to remotely access the BMSs.

  • Security group configuration

    To allow IP address 192.168.20.2 to remotely access Linux BMSs in a security group over the SSH protocol and port 22, you can configure the following security group rule.

    Protocol

    Direction

    Port Range

    Source

    SSH (22)

    Inbound

    22

    IPv4 address, IPv4 CIDR block, or another security group ID

    For example, 192.168.20.2

Case 3: Remotely Connecting to a Linux BMS Through SSH

  • Scenario

    To remotely connect to a Linux BMS through SSH, you need to add a security group rule.

    NOTE:

    The default security group comes with this rule. If you use the default security group, you do not need to configure the rule again.

  • Security group configuration

    Protocol

    Direction

    Port Range

    Source

    SSH (22)

    Inbound

    22

    0.0.0.0/0

Case 3: Remotely Connecting to a Windows BMS Through RDP

  • Scenario

    To remotely connect to a Windows BMS through RDP, you need to add a security group rule.

    NOTE:

    The default security group comes with this rule. If you use the default security group, you do not need to configure the rule again.

  • Security group configuration

    Protocol

    Direction

    Port Range

    Source

    RDP (3389)

    Inbound

    3389

    0.0.0.0/0

Case 5: Pinging a BMS from the Internet

  • Scenario

    To ping BMSs from each other to check connectivity, you need to add a security group rule.

  • Security group configuration

    Protocol

    Direction

    Port Range

    Source

    ICMP

    Inbound

    All

    0.0.0.0/0

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