Hi, Csuba. If you are installing RHEL 10 installing into an LPAR, then the z/OS hardware/network person must have made an assignment in the hardware configuration to permit your LPAR access to some OSA ports. One way or another, the network activity from z/OS must be using some OSA port(s) to communicate with the network, and you should be able to do the same...you should be able to use those OSA ports for your network connection, which you can then configure in the RedHat installer, once they give you the device addresses that have been assigned to your LPAR.
I installed RHEL 10 in virtual machines, where you have better control of the networking devices, and it still took me A LOT of work to get the first one going with the network configuration I wanted. The SECOND one, on the other hand, was much easier with the experience I'd gained from the first one.....along with a lot of help from IBM support. I still had to configure multiple OSAs and multiple HiperSockets networks in the RH installer, but once I understood it better, it went much more smoothly the second time. If you are sharing the OSAs with z/OS, remember that you can't use layer 2; your RH system can't use the OSA at layer 2 while z/OS is using it at layer 3. Same if you define HiperSockets connections; they have to be layer 3 in order for you to communicate over devices shared with z/OS, even if you aren't communicating with z/OS over those devices. Good luck!! R; Rob Hamilton Infrastructure Engineer Chemical Abstracts Service -----Original Message----- From: Linux on 390 Port <[email protected]> On Behalf Of Csaba Polgar Sent: Thursday, May 21, 2026 6:38 AM To: [email protected] Subject: [EXT] How to configure network properly when installing onto LPAR [Actual Sender is [email protected]] Hi all, we're in the middle of an installation of RHEL 10 to an LPAR where we boot the installer from sftp and as the installer source we need to use an https server. There isn't any zLinux in this environment yet. It seems like there is some issue with the network configuration as while we have the network configured with the installer and the firewall flows are allowed from the IP address we use with the installer to the https source, the installer is unable to connect to the https source. We were told, that in this environment VIPAs must be used to connect to the services of network devices, but configuring VIPA within the installer is not supported. We configured the network device of the installer with the OSA IP address, but a zOS network expert told us, that OSA IP addresses in this environment are used only by the network to identify OSA cards on layer 3 (I might err with describing this part due to my ignorance about that network's details and my level of general networking knowledge.) Does any of you possibly have experience with installing Linux onto an LPAR in a similar network environment? How should the network and the installer be configured there? Kind regards, Csaba Polgar Unless stated otherwise above: Kyndryl Hungary Korlátolt Felelősségű Társaság / Kyndryl Hungary Llc 8000 Székesfehérvár, Berényi út 72-100. 35. ép Cg.07-09-031714 - registering court: Székesfehérvári Törvényszék Cégbírósága ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390 Confidentiality Notice: This electronic message transmission, including any attachment(s), may contain confidential, proprietary, or privileged information from CAS, a division of the American Chemical Society ("ACS"). If you have received this transmission in error, be advised that any disclosure, copying, distribution, or use of the contents of this information is strictly prohibited. Please destroy all copies of the message and contact the sender immediately by either replying to this message or calling 614-447-3600. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390
