We have a provisioning system (promptlink) that we use to map cable modems to their static ip addresses. The provisioning system has a gui front end and it sits on linux and also acts as a dhcp server, etc. This is the same ip address that we use for cable-helper (like ip-helper on a cmts bundle ip interface) to forward dhcp requests from cable modem cpe, via the cmts, and unicasted to promptlink and then the static ip address reservation within the promptlink is sent back to the cpe This all continues to work, even during node splits, as long as we don't move that cm cpe to a different cmts... which would rarely happen since it's across town to get to our other RF environment served be a different cmts using a different static ip subnet... since we don't do L2 via cmts's in order to stitch back that ip into a more globally located static subnet... again, we don't do that. If the customers moves locations, into a different cmts area, that would be required to give back the single static /32 ip and get a different on. Unless they were a multi-static customer buying like a /29... in which case we have no problem moving that /29 subnet off that cmts and onto another one. That's easy. We do however have more centrally located subnets for some of our single static ip customers in FTTH... but not CMTS docsis. -Aaron -----Original Message----- From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Javier Gutierrez Guerra Sent: Thursday, May 7, 2020 3:50 PM To: nanog@nanog.org Subject: How to manage Static IPs to customers Hi there, Just wanted to reach out and get an idea how is people managing customers with static Ips, more specifically on Docsis networks where the customer could be moved between cmts's when a node is split Thanks in advance for all responses, Javier Gutierrez Guerra