Re: Private use of non-RFC1918 IP space

["Patrick W. Gilmore" <patrick () ianai net>]

On Feb 2, 2009, at 10:57 AM, Jeffrey Ollie wrote:
> On Mon, Feb 2, 2009 at 9:48 AM, Trey Darley <trey () kingfisherops com>  
> 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.
>
> I'd recommend against it, because even though the network is not
> connected to the Internet now you never know what the future holds.
> Even if it's never connected there are always things that seem to pop
> up and cause problems.
>
> Also, if you're address allocation policy has been so badly managed
> that you've run out of space in 10.0.0.0/8 adding more IPs to the pool
> isn't going to help for very long.

It will if you manage it better.

Fortunately, there's a /12 and a /24 still left.  A /12 is more space  
than 99.99% of the networks on the Internet need, so why wouldn't that  
suffice instead of using "real" space.

--
TTFN,
patrick