How to manage Static IPs to customers

Michael Crapse michael at
Fri May 8 15:54:23 UTC 2020

On our network(which isn't docsis, granted) we use PPPoE for all static IP
addresses, because it allows /32 ip address allocations for all home CPE
routers, upstream, the routers handle routing via ospf to change the path
of where that /32 public IP goes. It allows "zero touch" moving of a
customer from one PoP to another.

On Fri, May 8, 2020 at 8:34 AM <edwin.mallette at> wrote:

> So in most cases I'm aware of, the cable provider did not use RIP directly
> to a customer-managed device.  The cable operator would deploy their own
> managed device, implement RIP and the appropriate keychains between the
> operator-managed premise device and the CMTS.  As for the use cases, RIP
> was
> implemented to address the specific 'recombine' use case where one day (or
> evening) cable customer attachments could be moved from one CMTS to
> another.
> Instrumenting that with DHCP or TR69 usually required other teams'
> involvement and didn't allow portability.
> With IPv6 you get PD which helps immensely.
> Ed
> -----Original Message-----
> From: NANOG <nanog-bounces at> On Behalf Of Javier Gutierrez Guerra
> Sent: Friday, May 8, 2020 8:57 AM
> To: NANOG list <nanog at>
> Subject: RE: How to manage Static IPs to customers
> That's surprising to me, I have no intentions to do routing with our cable
> subscribers, that seems like a headache for both sides Today we have
> specific ranges within subnets from where we assign IPs to customers, my
> main problem that I'm trying to get around is having to change a customer
> static IP if their node gets splitter and I have to mode them to a
> different
> Thanks,
> Javier Gutierrez Guerra
> -----Original Message-----
> From: NANOG <nanog-bounces at> On Behalf Of Bryan Fields
> Sent: Thursday, May 7, 2020 5:57 PM
> To: nanog at
> Subject: Re: How to manage Static IPs to customers
> CAUTION: This email is from an external source. Do not click links or open
> attachments unless you recognize the sender and know the content is safe.
> On 5/7/20 5:54 PM, Brandon Jackson via NANOG wrote:
> > I have seen (Charter) and heard quite a few run RIP or some other
> > routing protocol on the CPE.
> Yep, it's RIP.  They don't support IPv6 on this either.  I've been asking
> for
> IPv6 since 2006, it's always next year.
> --
> Bryan Fields
> 727-409-1194 - Voice
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