PowerScale OneFS 9.8.0.0 Web Administration Guide

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IPv6 support

OneFS supports both IPv4 and IPv6 address formats on both on-premises and virtual cloud clusters. OneFS also supports dual stack.

OneFS supports the USGv6 standard of IPv6 used by the US Government.

The following table describes the distinctions between IPv4 and IPv6.

Table 1. IPv4 and IPv6 The following table describes the distinctions between IPv4 and IPv6.
IPv4	IPv6
32-bit addresses	128-bit addresses
Address Resolution Protocol (ARP)	Neighbor Discovery Protocol (NDP); Duplicate Address Detection (DAD)
	Router Advertisement

A subnet can use either IPv4 or IPv6 addresses, but not both. You set the IP family when creating the subnet, and all IP address pools that are assigned to the subnet must use the selected format.

Dual Stack

Dual stack means that a domain name can reference both IPv4 and IPv6 network pools. Dual stack networks always use IPV6 first, and fall back to IPV4 if IPV6 is not configured or available.

You can configure one subnet to be IPv4 and another to be IPv6. If a pool in both subnets has the same sc-dns-zone, and the sc-subnet references the same subnet (for example, they both reference the IPv4 subnet), that IPv4 subnet can now resolve for both IPv4 and IPv6 addresses.

NOTE: Network pools (and their sc-dns-zones) can only be resolved by a single subnet at a time. By default, pools are resolvable by their parent subnet (for example, subnet0 for subnet0.pool0). Setting the sc-subnet affects which subnet is responsible for resolving that subnet. For example, setting sc-subnet=subnet1 for subnet0.pool0 means that subnet0 can no longer resolve for subnet0.pool0 but subnet1 can resolve that subnet.