Hi, can I be honest with you. If I was presented "with insistence" the request of configuring multiple sites with the same network address, I would refuse to do that. I would probably also renounce the job if necessary.
Reason why, as network engineers we must do things "the right way" just like doctors, lawyers, other engineers do all the time.
Doing a network like the above is completely unprofessional and is something that one could not even mention on a resume.
Sorry if this is not the type of answer you were waiting for, and good luck in any case.
Again in my opinion, it is not a challenge, it is a requested made in deliberate disregard of any and all common networking practices.
You're correct that in certain cases there is no alternative to complicated NAT, so technology comes to help, however for example in the case of overlapping addresses, you end up with severe limitations, and a network to is not any to any, far from that. Since that is OK in most organizations, they can live with that.
In your case, it appears instead that this is a new deployment and the request has no technical grounds beside (hypothesizing here) some guy that wants an easy life installing servers with the same disk image everywhere.
You would end with cumbersome, limited, hard to maintain and hard to troubleshoot network.
Reason why, you've introduce on a paved road what IT refrains most - ambiguity.
Without the claiming humility on my side, let me tell you that from the experience of approx 20 yrs of IP networking, where I saw some cases like that, and all have failed miserably.
This is the reason why professionalism prevents myself from even thinking of doing something like that, or suggesting if and how it could be done.
Again, sorry for not really answering your question - rate '1' if you wish :)
On a personal level - I agree with you 100%. Overlapping network address space is a lousy situation. But please bear with me - there are genuine reasons why I'm stuck with the situation "as-is", and cant simply resolve the issue by insisting on unique addressing everywhere. I wont bore anyone with all the commercial details behind this - as this a technical forum after all :-)
So the question remains.
Within Cisco IOS, is it possible to implement NAT over an IPSEC/GRE tunnel between identically numbered subnets.
If the answer is a definitive no - then thats fine.
It would just make my life so much easier if there is a way of achieving this ...
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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