WEBVTT

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Stateless address autoconfiguration lets an IPv6 interface learn its address from a router advertisement.

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This lab connects router one and router two, with a prepared destination on another IPv6 network.

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On router one, enable IPv6 routing and give the connected interface a prefix length of sixty-four bits.

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Bring the interface up so the router can advertise this prefix on the link.

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On router two, enable autoconfiguration on the matching interface.

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Add the default keyword when this router should also learn the advertised default route.

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The client now has its own global IPv6 address, alongside its link-local address.

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Neighbor discovery identifies the advertising router on the connected link.

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The route marked N D is the learned default, using the advertising router as its next hop.

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Ping a destination outside the local prefix to verify that the learned default forwards traffic.

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The bare autoconfig command keeps address learning enabled without installing the advertised default route.

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Restore the default option, and keep a separate manual address on this interface.

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Save the configuration, then reopen the lab to verify that the configured mode is retained.

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The reopened client has its learned address and default again, and the remote destination remains reachable.

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Removing autoconfiguration removes the learned address and default, while preserving the manual address.

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Choose address learning alone, or include the default option when the lab also needs the advertised default route.