DoD IP Space

William Herrin bill at
Wed Feb 10 18:38:00 UTC 2021

On Fri, Jan 22, 2021 at 12:30 PM Izaac <izaac at> wrote:
> On Wed, Jan 20, 2021 at 02:47:32PM +0100, Cynthia Revström via NANOG wrote:
> > certain large corporations that have run out of RFC1918, etc. space
> At what level of incompetence must an organization operate to squander
> roughly 70,000 /24 networks?

Hi Isaac,

None whatsoever. You just have to be really big.

Imagine you're Amazon. You have this insanely large deployment of
servers. Your customers have this virtual concept you've presented
them called a "VPC" but there are no wires or routers. The subnets
only exist as bits in memory. The Virtual Private Cloud is a ruleset
in the network adapter of every physical machine running one of the
VMs that participate in the VPC. A big, flat network where every one
of these servers has a need to talk to every other server that could
possibly be tasked to run a VM in that VPC.

Bill Herrin

William Herrin
bill at

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