I have an EC2 instance set up called Machine1. I specified the security group to be Group1. How can I allow access in Group1 to any machine that comes from an internal EC2 request? Do I have the specify the IP address of each machine?


Machines from the same security group can acces other machine in the same security group (by default). Usually this is the topmost rule in the INBOUND rules table like:

ALL sg-xxxxxxx (default) Delete

You can add like this other security groups to the rules, just check out the other groups sg-xxxxxx id on it's Details tab and then add it as the new rules source.

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