CloudLabBox
Try the free demo

CCNP ENCOR lab 17 of 36

IPsec: static VTI with IKEv2, and GRE over IPsec

Encrypt Fernhill's branch links across the internet two ways: a static virtual tunnel interface with IKEv2 to Bristol, and GRE protected by IPsec with IKEv1 to Glasgow, then route both with OSPF and read the security associations.

Run this lab

It needs Lite: its 6 nodes are set to 6 vCPU and 4,096 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENCOR 350-401 guided labs, then 17 - IPsec - static VTI with IKEv2 and GRE over IPsec

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
Advanced
Time
About 80 minutes
Nodes need
6 vCPU, 4,096 MB
Smallest plan
Lite

The scenario

The GRE tunnels from lab 16 work, but the audit team has pointed out that GRE sends everything in clear text across the internet. Fernhill Freight's hub router in Leeds (R1) must now encrypt its links to Bristol (R2) and Glasgow (R3):

  • Bristol gets the modern design: a static virtual tunnel interface (VTI) protected by IPsec and negotiated with IKEv2.
  • Glasgow's router is managed by a partner who only supports IKEv1, so it keeps a GRE tunnel, now protected with IPsec.

OSPF must run over both tunnels so the three sites reach each other through Leeds.

DeviceInterfaceAddressNotes
R1 (hub)Gi0/0203.0.113.2/30Internet
R1Lo10 / Lo010.10.30.1/24 / 10.255.0.1/32HQ servers
R1Tunnel1 / Tunnel2172.16.12.1/30 / 172.16.13.1/30to R2 / to R3
R2 (Bristol)Gi0/0 / Gi0/1 / Tunnel1203.0.113.6/30 / 10.20.10.1/24 / 172.16.12.2/30PC2 10.20.10.10
R3 (Glasgow)Gi0/0 / Gi0/1 / Tunnel2203.0.113.10/30 / 10.30.10.1/24 / 172.16.13.2/30PC3 10.30.10.10
ISPGi0/0 / Gi0/1 / Gi0/2203.0.113.1 / .5 / .9don't change

Security policy: AES-256, SHA-256, Diffie-Hellman group 14. Pre-shared keys: Fh-Br1stol-VPN (Leeds–Bristol) and Fh-Glasg0w-VPN (Leeds–Glasgow). Each router already has a default route to the ISP. Router IDs: R*n* = n.n.n.n.

Topology: R1, R2 and R3 each connect to the ISP router; PC2 sits behind R2 and PC3 behind R3.

What you’ll practise

  • Explain what IPsec provides, the two IKE phases, ESP, and tunnel versus transport mode
  • Build IKEv2 proposals, policies, keyrings and profiles, and an IPsec profile
  • Configure a static VTI (tunnel mode ipsec ipv4) and route over it
  • Protect a GRE tunnel with IPsec in transport mode using IKEv1
  • Verify IKE and IPsec security associations and packet counters

The tasks

  1. Know what you're building
  2. IKEv2 building blocks on R1 and R2
  3. The static VTI to Bristol
  4. GRE over IPsec to Glasgow with IKEv1
  5. Route over both tunnels
  6. Prove the traffic is protected

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 IPsec - static VTI with IKEv2 and GRE over IPsec6 nodes, 5 links. Every link is listed as text below the diagram.R1ISPR2R3PC2PC3Gi0/1eth0Gi0/1eth0Gi0/0Gi0/0Gi0/0Gi0/1Gi0/0Gi0/2
6 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • R1 Gi0/0 to ISP Gi0/0
  • R2 Gi0/0 to ISP Gi0/1
  • R3 Gi0/0 to ISP Gi0/2
  • R2 Gi0/1 to PC2 eth0
  • R3 Gi0/1 to PC3 eth0
Nodes in IPsec: static VTI with IKEv2, and GRE over IPsec, 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
ISPCisco 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
PC2VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
PC3VPCS 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 ENCOR 350-401 guided labs.

  3. Open 17 - IPsec - static VTI with IKEv2 and GRE over IPsec 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.

More CCNP ENCOR labs

All CCNP ENCOR labs

Related labs in other courses

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.