Re: Companies using public IP space owned by others for internal routing

[Tom Carter <m1enrage () gmail com>]

RFC1918 isn't big enough to cover all use cases. Think about a large
internet service providers. If you have ten million customers, 10.0.0.0/8
would be enough to number modems, but what happens when you need to number
video set top boxes and voice end points? I don't think anyone goes out and
says "Lets go use someone else's space, because I don't want to use this
perfectly good private space".

On Sun, Dec 17, 2017 at 3:42 PM, Richard <rgolodner () infratection com> wrote:

> On 12/17/2017 04:30 PM, Robert Webb wrote:
>
> > Will anyone comment on the practice of large enterprises using non
> > RFC1918 IP space that other entities are assigned by ARIN for internal
> > routing?
> >
> > Just curious as to how wide spread this might be. I just heard of this
> > happening with a large ISP and never really thought about it until now.
> >
> > Robert
> >
> >
> >     It is more common than you would think. Why use public IP's when you
> can have many rfc1918 options. Always amazes me after the initial confusion.
>     Richard