The LNS Nodal Test Case
Use the LNS Nodal test case to test an L2TP Network Server (LNS) using the L2TP, IPSec, and PPP protocols. The test system emulates one or more L2TP Access Concentrators (LAC), establishing L2TP tunnels and sessions with the LNS, and listening for and responding to L2TP control messages from the LNS.
With this test case, you define:
-
The LAC emulator (node)
-
The session volume and rates, and an optional rate distribution model
-
L2TP, IPSec, and PPP attributes and behaviors
Measurements collected for these test cases include:
-
Counters that record the number and types of messages sent and received
-
Average response times for the different types of messages received from an SUT
-
Errors encountered during the test
-
Session state and rates
-
Tunnel state and rates
Test Terminology
An MN session is the result of an LAC successfully establishing an L2TP tunnel and an L2TP session for the MN with an LNS. The terms used for the various states that a session transitions through are defined as follows:
-
When the test begins, the test system reserves the resources necessary for the number of MN sessions defined, and the MN side of the sessions are initiated and placed in the pending state.
-
A pending MN session is started with an ICRQ from the LAC node.
-
The session is connected and established with when the PPP session is established.
-
If a session fails during or after establishment, and the retry failure rate reaches 100%, the session is left in the pending state.
-
An established session is disconnected with a termination that can originate from the LAC or LNS.
-
If a session is disconnected as part of a test cycle and will be re-connected, the test system retains the session's resources for later use, and the session enters the pending state.
-
When the disconnect occurs at the end of the test, the test system releases the session's resources as part of the test clean up.
Test Options
-
Add Data Traffic to the test to more closely simulate a live network using various wireless applications and protocols.
-
Encrypt L2TP control traffic and/or Data Traffic with the optional Dynamic IPSec feature.
Measurements
Measurements collected for the basic LNS Nodal test case are reported on the following tabs:
Additional measurements may be available depending on the test activity and options executed with the test case.