Default Security Groups

When creating an instance, you must associate it with a security group. If there is no security group available, a default security group will be created and associated with the instance. Note the following when using default security group:

Default Security Group Rules

Note the following when using default security group rules:

Inbound rules control incoming traffic to instances in the default security group. The instances can communicate with each other but cannot be accessed from external networks.
Outbound rules allow all traffic from the instances in the default security group to external networks.

Figure 1 Default security group

Table 1 describes the default rules for the default security group.

Table 1 Rules in the default security group
Direction	Action	Type	Protocol & Port	Source/Destination	Description
Inbound	Allow	IPv4	All	Source: default security group (default)	Allows IPv4 instances in the security group to communicate with each other using any protocol over any port.
Inbound	Allow	IPv6	All	Source: default security group (default)	Allows IPv6 instances in the security group to communicate with each other using any protocol over any port.
Outbound	Allow	IPv4	All	Destination: 0.0.0.0/0	Allows all traffic from the instances in the security group to any IPv4 address over any port.
Outbound	Allow	IPv6	All	Destination: ::/0	Allows all traffic from the instances in the security group to any IPv6 address over any port.

Parent topic: Security Group

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Security Group and Security Group Rule Overview

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Security Group Examples

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