ZyXEL Communications ZyWALL USG 1000 User Manual page 175

Click Security, select Advanced (custom settings) and click Settings.
8
Figure 147 Connect L2TP to ZyWALL: Security
Set Data encryption to Optional encryption (connect even if no
9
encryption) and the Allow these protocols radio button. Select Unencrypted
password (PAP) and clear all of the other check boxes. Click OK.
Figure 148 Connect ZyWALL L2TP: Security > Advanced
10 Click Yes. When you use L2TP VPN to connect to the ZyWALL, the ZyWALL
establishes an encrypted IPSec VPN tunnel first and then builds an L2TP tunnel
ZyWALL USG 1000 User's Guide
Chapter 8 L2TP VPN Example
179