You're confusing dynamic IP addresses with dynamic VIPA. I've never seen DVIPA use dynamic IP addresses.
A static IP address is an address that doesn't change. Many people incorrectly assume it's assigned to a specific machine. You decide how this IP address is used. Talk with your IBM hardware / software reps because you may not even need to involve your non-z/OS network people. The world has gone to smart routers and I suspect IBM included IBM smart routers in your configuration. In that case, everything is in your domain. It wouldn't be surprising if IBM smart routers automagically changed with DVIPA requirements. I'm more familiar with Unix these days which has seen improvements in high availability requirements. If you must involve your network people, don't tell them more than they need to know. You determine your DVIPA setup which is more about you than them. Let's assume a simple scenario. Let's say you have 10 systems in a sysplex with IP addresses 192.168.40.#. You have a static IP address 192.168.40.177 for DVIPA that will be on one or more of those machines. How will you tell his router the next hop for 192.168.40.177? Does he want to keep it simple and forward the packets to the next available z/OS system and let z/OS forward it to the correct system? As for DNS, he defines 192.168.40.177 once. DNS doesn't care where or what machine uses this address. If you're network person is insistent about DVIPA, tell him to think about it as a virtual network adapter but with more capabilities. This is all very dependent upon how you will use DVIPA. On Tue, 17 Oct 2023 10:07:14 +1300, Laurence Chiu <lch...@gmail.com> wrote: >I am having a debate with a network person (but not z/OS) how DVIPA works. >We have a LPAR with static IP which many hosts and firewalls know about it. >I want to make this host part of a sysplex and so need to make certain IP >addresses/ports dynamic so they can be switched to the second LPAR if the >first goes down. This is a typical business requirement for DVIPA. > >My view is we change the IP definition of the IP address from static to >virtual (VIPA) and the make it dynamic - hence DVIPA but it's actual value >does not change so that we need no firewall changes or DNS changes. > >He thinks we need a new IP address for the host and that means firewall and >DNS changes. Not not having worked in a static to VIPA environment before I >don't know but from my reading of the TCP documentation for z/OS it seems >we don't need a new IP address - just a change in the way it's defined. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
