Public IP address range being used inside an organisation?

I am currently working on a customer site and they have their Private IP address space set up to use a Public Class A IP address range.  Could anyone advise why this would be done?

I appreciate that by using NAT they will translate the private (internal addresses) to the outside world (public addresses) but what is stopping a conflict whereby someone on the web registers the same public Class A IP address range for their web server and then when the internal host from within this organisation tries to get to that web server on the Internet it ends up going to Bob's PC within the company instead as it has the same address?

I guess if this particular company has been allocated this specific Class A address range by the relevant authority that knowone else should be able to use it in the public arena, however does this actually prevent someone from using it?

I am used to seeing private IP address space being used within organisations and then being Natted out to Public as it is written in all the course books etc

I would appreciate a discussion on this topic

Cheers

David
canttalkeatingAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
There are entities that own particular public subnets,  My suggestion for you would be to validate if they do own the subnet and if so, no problem.  If they don't then I suggest migrating them to a private IP range,
0
canttalkeatingAuthor Commented:
Thanks mnkhawaja,

They do own it, so I guess what I am saying is valid in that another customer could potentially not own the Class A and still use it to address a public facing server in which case an issue would potentially occur when trying the route traffic from and internal host (using the Class A public address internally trying to get to the same public address externally.  Would my understanding be correct?

Thanks again,

David
0
LibipappachenCommented:
Hi David,

    dose this client have a local DNS sever? it is look like a DNS issue.

can we have the router running config?

BR,
Libi
0
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

canttalkeatingAuthor Commented:
Hi Libi,

This is only a hypothetical question, in that the client is real and they have their own DNS servers but I was just interested to know that in theory could it cause an issue if the same public addressing is used internally and externally elsewhere

Cheers

David
0
LibipappachenCommented:
Hi David,

   Without the proper routing in public internet space, no one can use the public IP address. So no one else use this client public IP addresses.

Form router please tries to get the following output.

router>www.sitename.com     #client site name

BR,
Libi
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
canttalkeatingAuthor Commented:
Thanks Libi,

So the ISPs etc would have to have routing set up for that Class A public address which is being used internally as a private address before it would cause a conflict.  Understood.

Unfortunately I can't give you the output you''re looking for on this occasion due to client confidentiality

Thanks for consulting

David
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Networking Protocols

From novice to tech pro — start learning today.