Re: Using private APNIC range in US

[Fred Baker <fred () cisco com>]

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.

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

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