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IPv6 in practice lab 2 of 12

NDP in depth: RS, RA, NS, NA, DAD and the M and O flags

Replace ARP in your head. Capture every Neighbor Discovery message on a live LAN, watch Duplicate Address Detection stop a clash on Linux and IOS, then change the M, O and A flags and router preference and see hosts react.

Run this lab

It needs Lite: its 4 nodes are set to 4 vCPU and 2,048 MB in total. That fits the free demo too.

In your workspace: Shared, then IPv6 in practice across vendors guided labs, then 02 - NDP in depth - RS RA NS NA DAD and the M and O flags

Try it free for 30 minutesRun it on Lite from £3 a day

The free demo needs no card and no email. Every lab plan includes every guided lab.

Level
Intermediate
Time
About 60 minutes
Nodes need
4 vCPU, 2,048 MB
Smallest plan
Lite

The scenario

The staff LAN at Kestrel Freight now runs IPv6, and the helpdesk keeps being asked why a laptop picks up the "wrong" address. Before anyone changes anything, you spend an hour reading the LAN: every Neighbor Discovery message, every flag. By the end you can explain exactly what each host hears and why it does what it does.

DeviceInterfaceAddress
R1Gi0/0fe80::1, 2001:db8:100:10::1/64, sends RAs every 15 s
R2Gi0/0fe80::2, 2001:db8:100:10::2/64, IPv6 routing off for now
H1, H2eth0SLAAC from R1's RAs
DeviceRunsHow to log in
R1, R2Cisco IOSv 15.9The console opens at >; enable has no password.
H1, H2Alpine Linuxroot, no password.

What you’ll practise

  • Identify RS, RA, NS and NA in a capture and name each one's source and destination
  • Work out a solicited-node multicast address and find it on a host and a router
  • Show Duplicate Address Detection stopping an address clash on Linux and IOS
  • Set the M, O and A flags on IOS and predict what a host does with each
  • Use router preference and a zero router lifetime to control which router hosts use

The tasks

  1. Start the Linux hosts
  2. Router Solicitation and Router Advertisement
  3. Neighbor Solicitation and Advertisement
  4. Duplicate Address Detection
  5. The M, O and A flags
  6. Two routers: preference and lifetime

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of NDP in depth - RS RA NS NA DAD and the M and O flags4 nodes and 1 network, 4 links. Every link is listed as text below the diagram.R1R2H1H2StaffGi0/0Gi0/0eth0eth0
4 nodes and 1 network, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 Gi0/0 to Staff (network)
  • R2 Gi0/0 to Staff (network)
  • H1 eth0 to Staff (network)
  • H2 eth0 to Staff (network)
Nodes in NDP in depth: RS, RA, NS, NA, DAD and the M and O flags, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
R2Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
H1Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB
H2Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder IPv6 in practice across vendors guided labs.

  3. Open 02 - NDP in depth - RS RA NS NA DAD and the M and O flags and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

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CloudLabBox is independent of Cisco, CompTIA, Juniper Networks and MikroTik. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.