I have two instances in the same region using the same security group. I want to allow all the instances in this security group to shell into each other. I have added the security group to port 22 thinking that this is the way to do it, but it does not work. Attempts to shell between machines fail.
I want to use the SG because not all of the instances have EIPs so it's not practical to put IPs into the SG.
What am I missing?