Companies using public IP space owned by others for internal routing

Mark Andrews marka at
Mon Dec 18 20:34:23 CST 2017

Companies like COMCAST did. They manage the modems over IPv6. 

They also supported DS-Lite’s development as a transition mechanism so they wouldn’t have to run IPv4 to their customers.  They wanted to be able to go IPv6 only. That meant having IPv4 as a service available. 

Mark Andrews

> On 19 Dec 2017, at 06:34, Harald Koch <chk at> wrote:
>> On 17 December 2017 at 17:48, Tom Carter <m1enrage at> wrote:
>> RFC1918 isn't big enough to cover all use cases. Think about a large
>> internet service providers. If you have ten million customers,
>> 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".
> :cough:
> They could use IPv6. I mean, if the mobile phone companies can figure it
> out, surely an ISP can...
> -- 
> Harald

More information about the NANOG mailing list