Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X, Configuration Manual

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Figure 22: L2TP with IPSec Application
Setting Up the Secure L2TP Connection
Figure 23 on page 290 gives an overview of the process used to set up a secure
connection between the client PC and an E Series router that is acting as a VPN
provider.
Figure 23: L2TP/IPSec Connection
To set up the secure connection shown in Figure 23 on page 290:
1.
Obtain an IP address from your ISP, using a normal B-RAS termination.
2.
IKE signals a security association (SA) between the client PC and the E Series
router that is acting as a VPN provider.
■
SAs are established to secure data traffic.
■
The IPSec connection secures L2TP traffic.
3.
Set up an L2TP tunnel and session between the client PC (the LAC) and the E
Series router (the LNS).
The tunnel runs over the SAs that IKE established.
290 ■
L2TP/IPSec Tunnels
JUNOSe 11.1.x IP Services Configuration Guide