Amazon Elastic Cloud Computing (EC2) service / Static IP permitted?

In AWS-EC2 Console you can associate a Elastic IP. This is a static IP that is dedicated for you. When the Elastic IP is not associate to a instance you pay for it.

In AWS-EC2 Console you can associate a Elastic IP. This is a static IP that is dedicated for you. When the Elastic IP is not associate to a instance you pay for it.No cost for Elastic IP addresses while in use $0.01 per non-attached Elastic IP address per complete hour $0.00 per Elastic IP address remap – first 100 remaps / month $0.10 per Elastic IP address remap – additional remap / month over 100 This IP you can assign to your running EC2 instance.

See setup dialog.

– RubiCon10 Jul 26 '10 at 12:47 (That's not what I need btw, but just trying to understand what this "static ip" could be used for) – RubiCon10 Jul 26 '10 at 12:48.

Elastic IP is the right thing to do for static IP. Whereas individual instances are configured via DHCP, and could technically be assigned a new IP address, your elastic IP never changes. The elastic IP address is effectively a second address that you can assign to your instance alongside the one assigned via DHCP.

One useful feature of elastic IP is that you can reassign it to a different instance transparently: if one of your instances fails, you can reassign the elastic IP address to a replacement instance with a single command.

As I understand it, the application itself needs to be on a system that has a static-ip. I don't think an elastic ip would work... – RubiCon10 Jul 26 '10 at 11:01 Can you explain more? Elastic IP gives you the guarantee that address a.b.c.

D will always route to your instance. Does your application need a stronger guarantee than that? (Does it inspect the hardware, for instance?) – Tim Robinson 10 Jul3 at 11:12 - the application documentation says that the minimum requirements are a static IP.

It does not say why or what for... I'm emailing the tech support of the company to inquire more - whether its actually needed... – RubiCon10 Jul 26 '10 at 11:59 The company says that a static IP is required... – RubiCon10 Jul 27 '10 at 4:59 Without knowing why one is required, it's hard to say whether elastic IP will be sufficiently static. Maybe you could try it and see what breaks? :) – Tim Robinson 10 Jul3 at 7:24.

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