LSF_DUALSTACK_PREFER_IPV6

Syntax

LSF_DUALSTACK_PREFER_IPV6=Y | y

Description

Define this parameter when you want to ensure that clients and servers on dual-stack hosts use IPv6 addresses only. Setting this parameter configures LSF to sort the dynamically created address lookup list in order of AF_INET6 (IPv6) elements first, followed by AF_INET (IPv4) elements, and then others.
Restriction:

IPv4-only and IPv6-only hosts cannot belong to the same cluster. In a MultiCluster environment, you cannot mix IPv4-only and IPv6-only clusters.

Follow these guidelines for using IPv6 addresses within your cluster:
  • Define this parameter only if your cluster

    • Includes only dual-stack hosts, or a mix of dual-stack and IPv6-only hosts, and

    • Does not include IPv4-only hosts or IPv4 servers running on dual-stack hosts (servers prior to LSF version 7)

    Important:

    Do not define this parameter for any other cluster configuration.

  • Within a MultiCluster environment, do not define this parameter if any cluster contains IPv4-only hosts or IPv4 servers (prior to LSF version 7) running on dual-stack hosts.

  • Applications must be engineered to work with the cluster IP configuration.

  • If you use IPv6 addresses within your cluster, ensure that you have configured the dual-stack hosts correctly. For more detailed information, see Administering IBM Platform LSF.

  • Define the parameter LSF_ENABLE_SUPPORT_IPV6 in lsf.conf.

Default

Not defined. LSF sorts the dynamically created address lookup list in order of AF_INET (IPv4) elements first, followed by AF_INET6 (IPv6) elements, and then others. Clients and servers on dual-stack hosts use the first address lookup structure in the list (IPv4).

See also

LSF_ENABLE_SUPPORT_IPV6

Parent topic: lsf.conf