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MikroTik MTCIPv6E lab 3 of 8

Neighbour discovery: RA tuning, router preference, DAD and MLD

Harbourside's office LAN has two routers and hosts that configure themselves, so everything depends on neighbour discovery. Capture router advertisements with tcpdump and tune them: interval, lifetimes, MTU, hop limit, DNS, the M and O flags and router preference. Then watch duplicate address detection fail on purpose, read neighbour states, turn on temporary addresses, and let the bridge snoop MLD.

Run this lab

It needs Lite: its 4 nodes are set to 4 vCPU and 1,536 MB in total. That fits the free demo too.

In your workspace: Shared, then MikroTik MTCIPv6E RouterOS v7 guided labs, then 03 - Neighbour discovery - RA tuning router preference DAD and MLD

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

Level
Advanced
Time
About 70 minutes
Nodes need
4 vCPU, 1,536 MB
Smallest plan
Lite

The scenario

The Harbourside office LAN (2001:db8:4800:10::/64) has a main router, R1, which also acts as the office switch (its ports ether1–ether3 are bridged as lan), and a backup router, R2. The PCs configure themselves with SLAAC, so neighbour discovery decides which router they use, what MTU and hop limit they use, and where they find DNS. Look at it on the wire, then tune it.

DeviceAddress
R1bridge lan: 2001:db8:4800:10::1/64, advertised
R2ether1: 2001:db8:4800:10::2/64, also advertised
PC1 · PC2 (Linux)SLAAC

What you’ll practise

  • Name the five ND messages and what each one does
  • Tune RouterOS router advertisements and read them on the wire
  • Use router preference to make one router the default and another the backup
  • See duplicate address detection, neighbour unreachability detection and temporary addresses on a host
  • Explain MLD and enable MLD snooping with a querier on a RouterOS bridge

The tasks

  1. The five messages
  2. Capture an RA
  3. Tune R1's advertisements
  4. A backup router with low preference
  5. Duplicate address detection and neighbour states
  6. Temporary addresses
  7. MLD snooping

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 Neighbour discovery - RA tuning router preference DAD and MLD4 nodes, 3 links. Every link is listed as text below the diagram.R1R2PC1PC2ether1eth0ether2eth0ether3ether1
4 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 ether1 to PC1 eth0
  • R1 ether2 to PC2 eth0
  • R1 ether3 to R2 ether1
Nodes in Neighbour discovery: RA tuning, router preference, DAD and MLD, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
R2MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
PC1Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB
PC2Alpine 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 MikroTik MTCIPv6E RouterOS v7 guided labs.

  3. Open 03 - Neighbour discovery - RA tuning router preference DAD and MLD 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 MikroTik. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.