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CCNP ENARSI lab 30 of 35

DHCPv4 and DHCPv6: server, relay, client and options

Centralise addressing on one IOS DHCP server: relay DHCPv4 for a user LAN and a branch router, fix a pool that hands out the wrong gateway, add options, and give the branch router a stateful DHCPv6 address through a DHCPv6 relay.

Run this lab

It needs Lite: its 5 nodes are set to 5 vCPU and 3,584 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENARSI 300-410 guided labs, then 30 - DHCPv4 and DHCPv6 - server relay client and options

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Level
Intermediate
Time
About 70 minutes
Nodes need
5 vCPU, 3,584 MB
Smallest plan
Lite

The scenario

Buzzard Engineering is moving every subnet's DHCP to one central IOS server, R1. The distribution router R2 serves the office LAN (PC1, PC2) and a link to a new branch router R3, which is to get both its IPv4 and IPv6 WAN addresses from R1. A colleague started the work: R1 already has a pool for the office LAN, but users complain that the PCs, when they get an address at all, can't reach anything outside the LAN.

DeviceInterfaceIPv4IPv6Notes
R1Gi0/010.30.12.1/242001:db8:30:12::1/64DHCP server
R2Gi0/010.30.12.2/242001:db8:30:12::2/64to R1
R2Gi0/110.30.23.1/242001:db8:30:23::1/64to R3 (relay)
R2Gi0/210.30.20.1/242001:db8:30:20::1/64office LAN (relay)
R3Gi0/0DHCP (10.30.23.10–254)DHCPv6 (2001:db8:30:23::/64)branch router
PC1, PC2eth0DHCP (10.30.20.50–254)–office PCs

Options for every IPv4 pool: DNS 10.30.12.53, domain buzzard.lab. The office LAN also needs option 150 (TFTP server for the IP phones) = 10.30.12.100 and a 2-day lease. DHCPv6 for R3: DNS 2001:db8:30:12::53, domain buzzard.lab.

What you’ll practise

  • Configure IOS DHCPv4 pools, excluded ranges and options (router, DNS, domain, lease, option 150)
  • Relay DHCPv4 with ip helper-address and explain the giaddr
  • Make a router a DHCP client and read the default route it installs
  • Configure a stateful DHCPv6 server, a DHCPv6 relay and a DHCPv6 client, with the M and O flags
  • Troubleshoot DHCP with bindings, pool statistics and client output

The tasks

  1. Find out why the PCs get nothing
  2. Relay DHCPv4 for the office LAN and fix the pool
  3. Make R3 a DHCPv4 client through the relay
  4. Stateful DHCPv6 through a relay

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 DHCPv4 and DHCPv6 - server relay client and options5 nodes and 1 network, 5 links. Every link is listed as text below the diagram.R1R2R3PC1PC2Office-LANeth0Gi0/2eth0Gi0/0Gi0/0Gi0/1Gi0/0
5 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 R2 Gi0/0
  • R2 Gi0/1 to R3 Gi0/0
  • R2 Gi0/2 to Office-LAN (network)
  • PC1 eth0 to Office-LAN (network)
  • PC2 eth0 to Office-LAN (network)
Nodes in DHCPv4 and DHCPv6: server, relay, client and options, 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
R3Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
PC2VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 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 CCNP ENARSI 300-410 guided labs.

  3. Open 30 - DHCPv4 and DHCPv6 - server relay client and options 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. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.