Version 6.2 309 February 2011
SIP User's Manual 3. Web-Based Management
5. Specify the IP address range that the device reserves for remote users, and then click
Next; the following is displayed if successfully configured:
Figure 3-252: PPTP Server Added Successfully
Note that the attention message alerting that there are no users with VPN
permissions.
6. Select the 'Edit the Newly Created Connection' check box, and then click Finish.
Figure 3-253: Editing VPN Server
7. Click the Click here to create VPN users link to define remote users that will be
granted access to your home network.
8. Click OK to save settings; the new PPTP server connection is added to the Network
Connection list.
3.3.3.9.8 Layer 2 Tunneling Protocol (L2TP)
Layer 2 Tunneling Protocol (L2TP) is an extension to the PPP protocol, enabling your
device to create VPN connections. Derived from Microsoft's Point-to-Point Tunneling
Protocol (PPTP) and Cisco's Layer 2 Forwarding (L2F) technology, L2TP encapsulates
PPP frames into IP packets either at the remote user's PC or at an ISP that has an L2TP
Remote Access Concentrator (LAC). The LAC transmits the L2TP packets over the
network to the L2TP Network Server (LNS) at the corporate side. L2TP is targeted at
serving two purposes:
Connecting the device to the Internet when it is used as a cable modem, or when
using an external cable modem. Such a connection is established using user name
and password authentication.
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