Using Region-X assigned IP space in Region-Y?

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1

Hello NANOG'ers,

This is a question that popped into my mind recently. So far my google-fu
has not turned up anything of use.

Imagine a company that has an RIR-assigned IPv4/23, and has it subnetted
into a pair of /24's so that they can have replicated datacenters in two
different geographical locations each running its own BGP infrastructure
(using the same ASN).

As far as I can see, this is all fine and good assuming that these two
sites are in the same RIR's domain.

Is it possible/allowable to move one of these datacenters to a different
geographical region with a different RIR and keep using the same two
subnets, or will a new /24 need to be requested from the new RIR?

If there's a book or reference that answers this question, please let me
know - I'm willing to do as much research on my own as I can.

Thanks!

2

There's only one question to be asked - will the (possibly new) upstream
of the moved datacenter announce the route for the /24 or not?

There's plenty of AS's that announce little chunks on different continents,
as long as the upstreams will carry the announcement, you're golden.

3

Why would the new upstream refuse to announce the /24 assuming he has the
correct information for his route objects and visible through the RIR
database.

Zaid

4
5

Some transit providers dislike announcing smaller networks, and thus have lower limits.

      Jima

6

Then the said transit provider customer will turn off the circuit and move
to the next transit provider that doesn't have a problem with /24. If you
are in a monopolistic ISP environment then it is different and that is a
different topicof discussion. Sadly been there done that.

Zaid

7

Which is why I said you need to find a willing upstream. And yes, if Mark
moving into a monopoly area, he'll probably have to do it the way the monopoly
wants it done.

8

Hello NANOG'ers,

This is a question that popped into my mind recently. So far my google-fu
has not turned up anything of use.

Imagine a company that has an RIR-assigned IPv4/23, and has it subnetted
into a pair of /24's so that they can have replicated datacenters in two
different geographical locations each running its own BGP infrastructure
(using the same ASN).

As far as I can see, this is all fine and good assuming that these two
sites are in the same RIR's domain.

It actually doesn't matter where they are located, but, it is a lot cleaner to use
different ASNs as the two networks have different routing policies.

Is it possible/allowable to move one of these datacenters to a different
geographical region with a different RIR and keep using the same two
subnets, or will a new /24 need to be requested from the new RIR?

Yes, not a problem.

If there's a book or reference that answers this question, please let me
know - I'm willing to do as much research on my own as I can.

Thanks!

As a general rule, you can get all your space from the RIR that serves
the region where your company has its headquarters, or, you can get
space from any region where you have equipment deployed.

Owen