Private use of non-RFC1918 IP space
sethm at rollernet.us
Mon Feb 2 22:24:20 UTC 2009
Stephen Sprunk wrote:
> Trey Darley wrote:
>> Some colleagues and I are running into a bit of a problem. We've been
>> using RFC 1918 Class A space but due to the way subnets have been
>> allocated we are pondering the use of public IP space. As the network
>> in question is strictly closed I don't anticipate any problems with
>> this as the addresses would be unambiguous within our environment. I'm
>> curious if anyone else is doing this.
> "Closed" networks nearly always end up getting connected to public
> networks, either by intent or by accident. If you act as if your
> network will remain "closed" forever, e.g. by using public addresses
> that are (or will be) assigned to someone else, you're going to cause a
> lot of headaches for yourself or your replacement down the road,
> Contrary to popular belief, ARIN (and possibly other RIRs) _will_ assign
> public IPs for private/closed networks if you can explain why RFC1918
> space will not suffice for your needs, e.g. because you are running a
> private internetwork between multiple companies and thus NAT/RFC1918 is
> simply not viable due to the number of ASes and the difficulty in
> avoiding collisions or the sheer number of hosts...
Or you can always get some PA space from an ISP rather easily.
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