Layer 2 Tunneling Protocol over IPSec
Complete the tasks outlined in this Practical Exercise. Also
review the Practical Exercise solution to see how you did and to see what
concepts you might need to review.
In this Practical Exercise, you are the administrator of an
L2TP Network Server (LNS), R1, and an L2TP Access Concentrator (LAC), dR3, which
will be the terminating endpoint for remote dial-in users.
Background Information
You will configure your LAC and LNS to accept incoming L2TP
encrypted IPSec connections from remote users. You will use the topology
illustrated in Figure 14-17.
Task 1: Configure R3
- Step 1. At the R3 console, provide all the configuration required to
configure the router as the LAC:
-
- Create a local account.
-
- Enable VPDN.
-
- Create a local IP pool.
-
- Define an access list that specifies L2TP traffic as
interesting.
-
- Configure an async line.
-
- Create an IKE policy.
-
- Define the IKE peer and key.
-
- Create an IPSec transform set.
-
- Create a crypto map.
-
- Assign the crypto map to an
interface.
Task 2: Configure R1
- Step 1. At the R1 console, provide all the configuration required to
configure the router as the LNS:
-
- Create a local account.
-
- Enable VPDN.
-
- Create a local IP pool.
-
- Define an access list that specifies L2TP traffic as
interesting.
-
- Create a VPDN group to accept tunnel requests.
-
- Configure the virtual template for cloning.
-
- Create an IKE policy.
-
- Define the IKE peer and key.
-
- Create an IPSec transform set.
-
- Create a crypto map.
-
- Assign the crypto map to an
interface.
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