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Should I use Amazon VPC in Amazon EC2 when I have multiple servers

I plan to have a multi-server architecture in amazon EC2, where the servers should talk to each other. These servers should be located in different regions of the Amazon (different data centers). Can i use amazon ec2 internal network? What are the security issues? Should I definitely use Amazon VPC in this setup.

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Jam,

If you plan to create instances in different regions, switch to VPC, because VPC gives you more security. You can also restrict these machines to limited external access. As part of security, VPCs are better than classic EC2 instances, as you can even enable VPCs for VPC connections.

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