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Saving IPv4 Addresses for Dual-Stack PPP Subscribers
You can save IPv4 addresses for dual-stack PPP subscribers when you are not using the IPv4 service. This provides on-demand IP address allocation or de-allocation after the initial PPP authentication and IPv6 address or prefix allocation. For dynamic profiles, changing this setting takes effect for any new subscribers. You can also include the Unisphere-Ipv4-release-control VSA in the Access-Request that is sent during on-demand IP address allocation. You can also include Interim-Accounting messages that are sent to report an address change.
