Users Guide

Dell PowerConnect W-AirWave 7.4 | Configuration Guide Configuration Reference | 165
 Computer-level authentication with a preshared key to create the IPSec security associations (SAs) to protect
the L2TP-encapsulated data.
 User-level authentication through a PPP-based authentication protocol using passwords, SecureID, digital
certificates, or smart cards after successful creation of the SAs.
Navigate to Advanced Services > VPN Services > L2TP from the navigation page. This page lists all L2TP
profiles that are currently available. Select Add to create a new L2TP profile, or click the pencil icon next to an
existing profile to modify settings. The Advanced Services > VPN Services > L2TP Add/Edit Details page
contains the following fields, as described in Table 90.
Select Add to complete the L2TP profile, or click Save to retain changes to an existing L2TP profile.
Advanced Services > VPN Services > PPTP
Point-to-Point Tunneling Protocol (PPTP) is an alternative to L2TP/IPSec. Like L2TP/IPSec, PPTP provides a
logical transport mechanism to send PPP frames as well as tunneling or encapsulation so that the PPP frames can
be sent across an IP network. PPTP relies on the PPP connection process to perform user authentication and
protocol configuration.
With PPTP, data encryption begins after PPP authentication and connection process is completed. PPTP
connections use Microsoft Point-to-Point Encryption (MPPE), which uses the Rivest-Shamir-Aldeman (RSA)
RC-4 encryption algorithm. PPTP connections require user-level authentication through a PPP-based
authentication protocol (MSCHAPv2 is the currently-supported method).
The PPTP page displays all PPTP profiles that are currently configured for use by VPN services. This page lists the
PPTP profile names, the VPN Services that reference these PPTP profiles, and the folder for each PPTP profile.
Select Add to create a new PPTP profile, or click the pencil icon next to an existing profile to edit. The Add/Edit
Details page appears.
Table 90 Advanced Services > VPN Services > L2TP Add/Edit Details Fields and Descriptions
Field Default Description
General Settings
Folder Top Set the folder with which the L2TP profile is associated. The drop-down menu
displays all folders available for association with the L2TP profile.
Name Blank Enter the name of the L2TP profile.
Other Settings
Enable L2TP Yes Enable or disable this L2TP profile.
PPP Authentication Modes PAP Select one or more authentication modes to support this L2TP profile.
Primary DNS Server Enter the IP address of the primary DNS server.
Secondary DNS Server Enter the IP address of the secondary DNS server.
Primary WINS Server Enter the IP address of the primary Windows Internet Naming Service (WINS)
server.
Secondary WINS Server Enter the IP address of the secondary WINS server.
Hello Timeout
(10-1440 secs)
60 Enter the time, in seconds, at which L2TP authentication times out.
SecurID Token Persistence
Timeout (15-10080 Mins)
1440 Enter the time, in minutes, at which the SecurID Token expires. requiring
reauthentication.