**[EC2-Classic] To add a rule that allows inbound SSH traffic**

This example enables inbound traffic on TCP port 22 (SSH). If the command succeeds, no output is returned.

Command::

  aws ec2 authorize-security-group-ingress --group-name MySecurityGroup --protocol tcp --port 22 --cidr 203.0.113.0/24

**[EC2-Classic] To add a rule that allows inbound HTTP traffic from a security group in another account**

This example enables inbound traffic on TCP port 80 from a source security group (otheraccountgroup) in a different AWS account (123456789012). If the command succeeds, no output is returned.

Command::

  aws ec2 authorize-security-group-ingress --group-name MySecurityGroup --protocol tcp --port 80 --source-group otheraccountgroup --group-owner 123456789012

**[EC2-VPC] To add a rule that allows inbound SSH traffic**

This example enables inbound traffic on TCP port 22 (SSH). Note that you can't reference a security group for EC2-VPC by name. If the command succeeds, no output is returned.

Command::

  aws ec2 authorize-security-group-ingress --group-id sg-903004f8 --protocol tcp --port 22 --cidr 203.0.113.0/24

**[EC2-VPC] To add a rule that allows inbound HTTP traffic from another security group**

This example enables inbound access on TCP port 80 from the source security group sg-1a2b3c4d. Note that for EC2-VPC, the source group must be in the same VPC. If the command succeeds, no output is returned.

Command::

  aws ec2 authorize-security-group-ingress --group-id sg-111aaa22 --protocol tcp --port 80 --source-group sg-1a2b3c4d

**[EC2-VPC] To add a custom ICMP rule**

This example uses the ``ip-permissions`` parameter to add an inbound rule that allows the ICMP message ``Destination Unreachable: Fragmentation Needed and Don't Fragment was Set`` (Type 3, Code 4) from anywhere. If the command succeeds, no output is returned. For more information about quoting JSON-formatted parameters, see `Quoting Strings`_.

Command::

  aws ec2 authorize-security-group-ingress --group-id sg-123abc12 --ip-permissions '[{"IpProtocol": "icmp", "FromPort": 3, "ToPort": 4, "IpRanges": [{"CidrIp": "0.0.0.0/0"}]}]' 

For more information, see `Using Security Groups`_ in the *AWS Command Line Interface User Guide*.

.. _`Using Security Groups`: http://docs.aws.amazon.com/cli/latest/userguide/cli-ec2-sg.html
.. _`Quoting Strings`: http://docs.aws.amazon.com/cli/latest/userguide/cli-using-param.html#quoting-strings