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Administration Guide

Appendix G. Tolerating IPv6 alias addresses

The PSSP software requires that the SP and clustered enterprise server systems use Internet Protocol Version 4 (IPv4) for all interface addresses. IPv6 is a version of the Internet Protocol that extends addressing capability. IPv6 has been in a research and experimental stage in various pockets of the industry. Because of this interest and to prepare for future development, most PSSP 3.2 components can tolerate IPv6 alias addresses coexisting with the required IPv4 network addresses for Ethernet and Token Ring interfaces only. Understand and keep in mind that none of the PSSP software components actually use IPv6 addresses. Do not add IPv6 aliases if your system uses an SP switch, runs any level earlier than PSSP 3.2, or uses the DCE, HACWS, or HACMP LPP. Those products do not tolerate IPv6 aliases.

You might have your own research and experimental projects and goals for using IPv6. If your system environment is free of all IPv6-intolerant components and you have the knowledge and experience to sustain such a system independently, you might be able to add IPv6 aliases for the IPv4 addresses on Ethernet or Token Ring network interfaces.

If under those conditions you still want to add IPv6 aliases, be certain to carefully read and understand the information concerning IPv6 in the publications for each IBM LPP on your system. Several ways of adding IPv6 alias addresses might put the availability and serviceability of your system at risk. IBM suggests you use the chdev command to safely add and delete IPv6 aliases for IPv4 addresses.

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