Get as much IP space as you ever dreamed of, was: Re: Looking to buy IPv4 addresses from class C swamp

Tue Apr 29 04:06:00 UTC 2003

Kai Schlichting wrote:
> An example covering this exact case: 9.0.0.0/8 is such a space, owned by IBM.
> 
> Some illicit use documented at www.ris.ripe.net :
> 
> 9.184.112.0/20
> 9.186.144.0/20 , both from AS 3786 (dacom.co.kr, bora.net) , since at
> least 2002/12/26.
> 
> IBM confirmed the bogosity of these announcements on 04/07, the routes
> got withdrawn on 04/14.

Actually, IBM confirmed that any announcements from 9/8 were guaranteed 
to be bogus. IBM uses 9/8 internally. They use NAT to convert 9/8 
addresses back to routed addresses. One can imagine that IBM has a large 
internal network globally with interconnects to various partners. Yet 
many companies have found that utilization of NAT when communicating 
with the public networks is a sound addition to security.

Private peering follows different rulesets than public. Many respectable 
organizations still don't understand that you can Peer privately without 
exporting each others advertisements in order to save expenditures to 
third parties when transiting traffic between the two networks. Security 
percautions are also treated different. What you would offer a partner 
sometimes exceeds the access you'd allow the public.

While there are benefits to registering space that isn't routed on the 
public network, such space needs to be declared as such. Until that 
time, people will continue to hijack those networks and use them for 
their own ends.

-Jack