🎓 EASYTUTORGUIDE

Practical tutorials, tools, courses, digital skills, and business promotion.

★ Free Learning

Chapter 16 — IPv6 Configuration and Neighbor Discovery

A complete networking lesson based on the course chapter menu.

20 topicsPractical examplesTroubleshooting checksReview Q&A

Estimated reading time0% read

Chapter 16: IPv6 Configuration and Neighbor Discovery

This chapter follows the topics shown in the Networking chapter menu. Work through each section in order, then use the review questions to check recall and troubleshooting reasoning.

16.1 SLAAC

SLAAC lets an IPv6 host form addresses using information advertised by routers, subject to network policy and operating-system behavior.

Example: place SLAAC in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain SLAAC without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.2 Router Advertisement

Router Advertisement affects how Layer 3 devices choose a path toward destination networks. Correct routing depends on the destination prefix, route source, next hop or exit interface, route preference, metric, and reachability of the next step.

Example: a router receives a packet for 10.20.30.40 and has several matching routes. It selects the most specific matching prefix, then forwards toward the route's next hop or exit interface if that path is usable.

What to check

Check the destination prefix and the most-specific matching route.
Verify next-hop reachability, route source, preference, metric, and return path.
Confirm that ACLs, NAT, VPN policy, or upstream routing are not blocking an otherwise-correct route.

Practice: Practice: explain Router Advertisement without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.3 Router Solicitation

Router Solicitation affects how Layer 3 devices choose a path toward destination networks. Correct routing depends on the destination prefix, route source, next hop or exit interface, route preference, metric, and reachability of the next step.

What to check

Check the destination prefix and the most-specific matching route.
Verify next-hop reachability, route source, preference, metric, and return path.
Confirm that ACLs, NAT, VPN policy, or upstream routing are not blocking an otherwise-correct route.

Practice: Practice: explain Router Solicitation without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.4 DHCPv6

DHCP automatically supplies IP configuration such as an address, mask or prefix, gateway, DNS servers, and lease information. IPv4 clients commonly use the Discover, Offer, Request, Acknowledge exchange.

Example: a laptop joins a LAN with no manual IP configuration. It broadcasts or multicasts the appropriate discovery traffic, receives an offer, requests the selected lease, and then applies the address, gateway, DNS settings, and lease timers.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain DHCPv6 without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.5 Stateful DHCPv6

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Stateful DHCPv6 without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.6 Stateless DHCPv6

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Stateless DHCPv6 without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.7 Neighbor Discovery Protocol

IPv6 Neighbor Discovery uses ICMPv6 for functions such as router discovery, prefix discovery, neighbor reachability, and address resolution.

Example: place Neighbor Discovery Protocol in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Neighbor Discovery Protocol without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.8 Neighbor Solicitation

Neighbor Solicitation is one of the core topics in IPv6 Configuration and Neighbor Discovery. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Example: place Neighbor Solicitation in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Neighbor Solicitation without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.9 Neighbor Advertisement

Neighbor Advertisement is one of the core topics in IPv6 Configuration and Neighbor Discovery. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Example: place Neighbor Advertisement in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Neighbor Advertisement without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.10 ICMPv6

ICMP carries control and diagnostic messages used by IP, including reachability and error information. Tools such as ping commonly rely on ICMP echo messages.

Example: place ICMPv6 in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain ICMPv6 without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.11 Duplicate Address Detection

Duplicate Address Detection is one of the core topics in IPv6 Configuration and Neighbor Discovery. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Example: place Duplicate Address Detection in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Duplicate Address Detection without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.12 IPv6 Default Router

A default route is the least-specific route and is used when no more-specific destination prefix matches.

What to check

Check the destination prefix and the most-specific matching route.
Verify next-hop reachability, route source, preference, metric, and return path.
Confirm that ACLs, NAT, VPN policy, or upstream routing are not blocking an otherwise-correct route.

Practice: Practice: explain IPv6 Default Router without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.13 Link-Local Gateway

Link-Local Gateway is one of the core topics in IPv6 Configuration and Neighbor Discovery. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Example: place Link-Local Gateway in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Link-Local Gateway without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.14 AAAA DNS Records

DNS translates names into resource records such as IP addresses, aliases, mail-routing information, and service data. Client caching and TTL values affect how quickly changes become visible.

Example: a user can reach 203.0.113.20 but cannot reach server.example by name. That difference points toward name resolution, DNS reachability, record content, cache state, or search-suffix behavior rather than basic IP routing.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain AAAA DNS Records without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

16.15 Dual Stack

Dual Stack is one of the core topics in IPv6 Configuration and Neighbor Discovery. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Example: place Dual Stack in a small office network containing clients, switches, a router, wireless access, DNS/DHCP services, and an internet connection. Identify which device or layer owns the function and what evidence you would inspect to verify it.

What to check

Identify which OSI/TCP-IP layer and device type are primarily responsible.
Check configuration, interface or service state, counters, logs, and a simple end-to-end test.
Verify both normal operation and one realistic failure case so you understand what changes when the feature breaks.

Practice: Practice: explain Dual Stack without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.