Configuring L2TP Services

Enabling L2TP on an Unconfigured WAN Interface

To enable L2TP on an unconfigured WAN interface, complete the following tasks:

Site Manager Procedure

You do this

System responds

 

 

 

1.

In the Configuration Manager window,

The Add Circuit window opens.

 

choose a WAN connector.

 

 

 

 

2.

Accept the default circuit name or change

The WAN Protocols window opens.

 

it, then click on OK.

 

 

 

 

3.

Choose PPP, Frame Relay, or ATM then

The Select Protocols window opens.

 

click on OK.

 

 

 

 

4.

Choose L2TP, then click on OK.

The IP Configuration window opens.

 

 

 

5.

Enter the IP address of the LNS (router),

The L2TP Configuration window opens.

 

then click on OK.

 

 

 

 

6.

Set the following parameters:

 

 

RADIUS Primary Server IP Address

 

 

RADIUS Primary Server Password

 

 

RADIUS Client IP Address

 

 

 

Click on Help or see the parameter

 

 

 

descriptions beginning on page A-5.

 

 

 

 

7.

Click on OK.

The L2TP Tunneling Security window

 

 

 

opens.

 

 

 

8.

Click on OK.

The L2TP IP Interface List window opens,

 

 

 

followed by the L2TP IP Configuration

 

 

 

window.

 

 

 

9.

Set the following parameters:

Site Manager displays a message

 

L2TP IP Interface Address

alerting you of the time delay to create

 

Subnet Mask

the L2TP tunnel circuits.

 

 

Click on Help or see the parameter

 

 

 

descriptions beginning on page A-11.

 

 

 

10. Click on OK.

You return to the L2TP IP Interface List

 

 

 

window, which displays the IP interface

 

 

 

address and the subnet mask. A

 

 

 

message window opens that reads, L2TP

 

 

 

Configuration is completed.

 

 

 

 

 

 

 

(continued)

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Nortel Networks manual Enabling L2TP on an Unconfigured WAN Interface, Subnet Mask

L2TP specifications

Nortel Networks L2TP, or Layer 2 Tunneling Protocol, is a widely recognized networking protocol that enables the tunneling of data over various networks. Initially developed as an extension of the Point-to-Point Tunneling Protocol (PPTP), L2TP integrates components from both PPTP and Layer 2 Forwarding (L2F). Nortel Networks played a significant role in the development and implementation of L2TP, making it a prominent choice for service providers and enterprise networks seeking secure and efficient connectivity.

One of the primary features of L2TP is its ability to encapsulate data packets, allowing the transport of PPP (Point-to-Point Protocol) frames without necessitating the traditional point-to-point connections. This means L2TP can operate across different networks, facilitating remote access connections and VPNs (Virtual Private Networks). As a result, organizations can achieve greater flexibility in managing their communications infrastructure.

Another key characteristic of L2TP is its support for both IPv4 and IPv6, ensuring compatibility with current and future networking environments. L2TP operates at the link layer of the OSI model, which means it functions between the data link and network layers, making it versatile for various applications. By using UDP (User Datagram Protocol) as a transport protocol, L2TP ensures efficient data transmission while maintaining lower latencies.

Security is a critical aspect of L2TP. While L2TP itself does not provide encryption, it is often paired with IPSec (Internet Protocol Security) for enhanced security protocols. This combination offers both tunneling and encryption, creating a secure framework for transmitting sensitive information across potentially insecure networks, such as the Internet.

L2TP also features various authentication methods, allowing for robust access control. It supports various schemes like PAP (Password Authentication Protocol) and CHAP (Challenge Handshake Authentication Protocol), giving network administrators a range of options to ensure the legitimacy of users accessing the network.

In summary, Nortel Networks L2TP is a powerful tunneling protocol known for its flexibility, compatibility, and security features. Its ability to encapsulate data for efficient transport makes it ideal for remote access and VPN applications. As organizations continue to demand secure, seamless connectivity, L2TP remains a resilient choice within the shifting landscape of networking technologies.