Sign up ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

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

What IP address will 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.

share|improve this question

1 Answer 1

up vote 16 down vote accepted

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

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

share|improve this answer
+1 for – mgorven Feb 20 '13 at 20:50
Also +1 for – 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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.