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I am trying to make a kind of proxy using elastic IPs on my Amazon EC2 instance. My question is, say I associate an elastic IP to my Amazon instance, and then I make an outbound connection from my EC2 instance to a server, say www.yahoo.com.

What IP address will www.yahoo.com see, the original Amazon EC2 server IP or the elastic IP I have associated to it?

Sorry if this is a basic question, but this is all new to me.

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If an elastic IP is associated with an EC2 instance, that's the instance's external IP.

You can demonstrate this by doing curl canhazip.com in the command line.

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    +1 for canhazip.com – mgorven Feb 20 '13 at 20:50
  • Also +1 for canhazip.com – chrskly Feb 21 '13 at 0:01
  • Does this apply to VPC's? My outgoing IP does not appear to be the same as the Elastic IP applied to the main interface. – John McKim Sep 17 '14 at 7:51
  • @JohnMcKim Yes, it applies to VPCs. The only caveat is sometimes you'll have your VPC subnet going through a NAT instance rather than directly. – ceejayoz Sep 17 '14 at 12:47
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    @flickerfly Yes, you'd be showing up as the NAT instance's EIP. – ceejayoz Jun 23 '17 at 1:03

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