was bogon filters, now "Brief Segue on 1918"

Jay R. Ashworth jra at baylink.com
Wed Aug 6 13:08:10 CDT 2008

On Wed, Aug 06, 2008 at 09:36:05AM -0700, Joel Jaeggli wrote:
> Darden, Patrick S. wrote:
> >Most organizations that would be doing this would not randomly pick out 
> >subnets, if I understand you.  They would randomly pick out a subnet, then 
> >they would sub-subnet that based on a scheme.  I believe this is the 
> >intent of RFC 1918.  Not to apply a random IP scheme, but to randomly pick 
> >a network from the appropriate sized Private Networking ranges, then apply 
> >a well thought out scheme to the section of IP addresses you chose.
> >
> >E.g. 10.150.x.y/16 as their network.  X could be physical positioning, and 
> >Y could be purposive in nature. as basement, as 
> >first floor, as second floor, etc.  1-20 as switches/routers, 
> >21-50 as servers and static workstations, 51-100 as printers, and 101--200 
> >as DHCP scope for PCs, and 201-254 for remote login DHCP scope (vpn, 
> >dialup, etc.)
> >
> >Yes, I think a large private network would work this way.  RFC 1918 wants 
> >it to work this way (imho).

I'm certain that wasn't the intent of 1918, from the "random" wording.

> How much of 10/8 and 172.16/12 does an organization with ~80k employees, 
> on 5 continents, with hundreds of extranet connections to partners and 
> suppliers in addition to numerous aquistions and the occasional 
> subsidiary who also use 10/8 and 172.16/12 use?

My network serves around 300 machines and employees, and uses 10.10/16,
though very sparsely -- we do indeed subject one /24 per function.

The *point* though, is that it's 10.*10*.

Another client is using 10.55.storenumber with one /24 per store.

-- jra
Jay R. Ashworth                   Baylink                      jra at baylink.com
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates     http://baylink.pitas.com                     '87 e24
St Petersburg FL USA      http://photo.imageinc.us             +1 727 647 1274

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