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From Robin Verlangen <ro...@us2.nl>
Subject Re: why do I have to use internal IP for EC2 nodes?
Date Wed, 05 Sep 2012 06:08:33 GMT
@Yang: Sounds legit, as internal is not the same as external. Beware of the
fact that internal traffic is only free when it's in the same availability
zone. In the same region is charged with a small amount (~ $0.01).

With kind regards,

Robin Verlangen
*Software engineer*
*
*
W http://www.robinverlangen.nl
E robin@us2.nl

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2012/9/5 Yang <teddyyyy123@gmail.com>

> thanks, but if the communication between cluster nodes all resolve to
> "internal to internal", amazon will not charge the traffic as external
> traffic, right?
>
> On Tue, Sep 4, 2012 at 7:08 PM, aaron morton <aaron@thelastpickle.com>wrote:
>
>> 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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