Re: Using private APNIC range in US

[Cian Brennan <cian.brennan () redbrick dcu ie>]

On Thu, Mar 18, 2010 at 09:34:47AM -0700, Fred Baker wrote:
> Are they using them only within their domain(s), and ARIN addresses outside, or are they advertising them to their 
> upstream(s) to be readvertised into the backbone?
>
> If they are using them internally and NAT'ing to the outside, they're not hurting themselves or anyone else. I would 
> personally let them alone.
Right up until someone actually starts *using* 1/8, in which case they're
hurting both themslves, and who ever gets stuck with it.

> If they are advertising them outside, it adds a small prefix in the ARIN domain that doesn't get aggregated by the 
> upstream. Among 300K such prefixes it is probably noise, but gently suggesting that they use something aggregatable 
> into their upstream's allocation would help a little bit in that regard. What they are most likely hurting is 
> themselves, really; a datagram sent to the address from an ISP outside themselves probably travels via Australia or 
> an Australian ISP.
>
> On Mar 18, 2010, at 8:52 AM, Jaren Angerbauer wrote:
>
> > Hi all,
> >
> > I have a client here in the US, that I just discovered is using a host
> > of private IPs that (as I understand) belong to APNIC (i.e.
> > 1.7.154.70, 1.7.154.00-99, etc.) for their web servers.  I'm assuming
> > that the addresses probably nat to a [US] public IP.  I'm not familiar
> > enough with the use of private address space outside of ARIN (i.e.
> > 192.0.0.0, 10.0.0.0, etc) but I figure if their sites are up and
> > accessible it must be working for them.  I'm just wondering if there
> > is any recommendation or practice around this -- using private IP
> > ranges from another country.  Thanks.
> >
> > --Jaren
>
> http://www.ipinc.net/IPv4.GIF

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