ZyXEL Communications ZyWALL 110 Handbook page 237

In the User Authentication section, enter Password which should be the same as Allowed User
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created in ZyWALL/USG (zyx123 in this example).
In the Machine Authentication section, enter Shared Secret to be the pre-shared key of the
IPSec VPN gateway the ZyWALL/USG uses for L2TP VPN over IPSec (zyx12345 in this example).
Click OK.
Figure 574
Go back to Configuration and click Advanced.... Select Send all traffic over VPN connection
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to allow the L2TP/IPSec VPN traffic between ZyWALL/USG and MAC OS X system.
Figure 575
Figure 576
Go back to Configuration and click Connect.
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Figure 577
Chapter 5 Create Client-to-Site VPN Tunnels
ZyWALL/USG Series User's Guide
237