public Builder ipv6(String ipv6) {
            return ipv6(Output.of(ipv6));
        }
@param ipv6 IPv6 defines an IPv6 IP block in CIDR notation(e.g. &#34;2001:db8::/64&#34;). At least one of IPv4 and IPv6 must be specified. This field is immutable.

@return builder
sdk/java/src/main/java/com/pulumi/kubernetes/networking/v1alpha1/inputs/ClusterCIDRSpecArgs.java