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From aaron morton <aa...@thelastpickle.com>
Subject Re: why do I have to use internal IP for EC2 nodes?
Date Wed, 05 Sep 2012 02:08:02 GMT
See http://aws.amazon.com/articles/1145?_encoding=UTF8&jiveRedirect=1#12

The external  dns will resolve to the internal IP when resolved internally. 

Using the internal IP means you are not charged for IO and it makes it clear you do not expect
this service to be access from outside. 

Cheers
 
-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 5/09/2012, at 7:37 AM, Yang <teddyyyy123@gmail.com> wrote:

> http://www.datastax.com/docs/1.1/initialize/cluster_init
> 
> 
> says:
> 
> " Note  In the - seeds list property, include the internal IP addresses of each seed
node."
> 
> why do I have to use internal IP?
> on a EC2 node,
> hostname resolution seems to directly give its internal IP:
> 
> $ host aws1devbic1.biqa.ctgrd.com
> aws1devbic1.biqa.ctgrd.com is an alias for ec2-50-17-3-229.compute-1.amazonaws.com.
> ec2-50-17-3-229.compute-1.amazonaws.com has address 10.28.166.83
> 
> so using the public DNS or internal IP seems to be the same thing, or something I'm missing
?
> 
> Thanks
> Yang
> 


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