16. IPv6 Neighbor Solicitation and Advertisement

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Neighbor Solicitation (NS) and Neighbor Advertisement (NA) are key messages in the IPv6 Neighbor Discovery Protocol (NDP), playing critical roles in IPv6 communication. These messages handle tasks like address resolution (replacing ARP) to determine link-layer addresses from IPv6 addresses, checking for duplicate addresses (Duplicate Address Detection), and performing neighbor unreachability detection. In this section, we will demonstrate how these functions work in practice.

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14. IPv6 Neighbor Discovery Protocol and Messages

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IPv6 Neighbor Discovery Protocol (NDP) is a key protocol in IPv6 networks used for enabling communication between devices on the network. In this lesson, we will cover how NDP works, focusing on its key message types—Router Solicitation, Router Advertisement, Neighbor Solicitation, and Neighbor Advertisement—along with its critical functions like router and prefix discovery, address resolution, Duplicate Address Detection (DAD), and Neighbor Unreachability Detection (NUD).

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11. Stateful DHCPv6

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When an endpoint receives a Router Advertisement (RA) with the M flag, it uses DHCPv6 to obtain its IPv6 address and configuration details like the DNS server and domain name, while still learning the default gateway, prefix, and prefix length from the RA. We will also demonstrate a DHCPv6 configuration on a Cisco IOS router, with the DHCPv6 relay agent covered in the next lesson.

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10. Stateless DHCPv6

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Stateless DHCPv6 is a mode of DHCP for IPv6 in which the client obtains its IP address and default gateway through Router Advertisements (RA), but uses the DHCPv6 server to acquire other configuration details, such as DNS servers, NTP servers, or domain search lists. Unlike stateful DHCPv6, the server does not track or assign IP addresses, making it “stateless.”

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