Note: A 2022 tutorial on the many aspects of IPv6 can be found in this All Things TECH IPv6 on Linux article.
Open Software-Und-System-Entwiklung (openSUSE) Linux and SUSE Linux Enterprise Server (SLES) maintain parallel coordinated development tracks. Internet Protocol version 6 (IPv6) in openSUSE and SLES was enabled by default beginning in version 10.1. The system setup and configuration Yet another Setup Tool (YaST) fully supported IPv6 since version 10.3.
To enable IPv6 in openSUSE Linux version 11.4 and later, see this SDB: Native IPv6 article. Reboot when done. IPv4 will continue to run.
To enable IPv6 in SLES version 12 SP5 and later, see paragraph 17.2 IPv6 – The Next Generation Internet in chapter 17.2 of the SUSE Linux Enterprise Server 12 SDP Administration Guide. Reboot when done. IPv4 will continue to run. Also, in the absence of applicable policy or guidance about hardening SLES to guard against potential IPv6-related attacks, a guide for configuring SLES 12 and later to prevent IPv6-related attacks is provided by this article.