ZyXEL Communications ZyWALL 110 Handbook page 331

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In the User Authentication section, enter Password which should be the same as
Allowed User 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.
Go back to Configuration and click Advanced.... Select Send all traffic over VPN
connection to allow the L2TP/IPSec VPN traffic between ZyWALL/USG and MAC OS
X system.
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