L2Tp With Ipsec Control And Data Frames; Compatibility And Requirements; Client Software Supported; Interactions With Nat - Juniper JUNOSE 11.0.X IP SERVICES Configuration Manual

L2TP with IPSec Control and Data Frames

L2TP and IPSec define control and data messages used for L2TP/IPSec. Figure 24 on
page 291 shows an L2TP control frame encapsulated by IPSec. The shaded area shows
the encrypted portion of the frame.

Figure 24: L2TP Control Frame Encapsulated by IPSec

Figure 25 on page 291 is an L2TP data frame encapsulated by IPSec. The shaded area
shows the encrypted portion of the frame.

Figure 25: L2TP Data Frame Encapsulated by IPSec

Compatibility and Requirements

This section covers various compatibility issues and requirements for the L2TP/IPSec
traffic.

Client Software Supported

The L2TP/IPSec software supports the following client PC operating systems and
L2TP and IPSec applications:

Interactions with NAT

There are two ways that you can configure E Series routers to interact with Network
Address Translation (NAT) devices in the network:
Windows 2000 and Windows XP running built-in IPSec VPN software
Microsoft L2TP/IPSec VPN client for Windows NT, Windows 98, and Windows
Me
SafeNet client software
Mac OS X version 10.3 or higher
Chapter 12: Securing L2TP and IP Tunnels with IPSec
L2TP/IPSec Tunnels
291