ZyXEL Communications ZyWALL 110 Handbook & Instructions page 51

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Figure 77 CONFIGURATION > Object > Address
Go to CONFIGURATION > Object > Service > Service Group, create a service
group for the following UDP ports:
UDP Port Number = 1701 → Used by L2TP
UDP Port Number = 500 → Used by IKE
UDP Port Number = 4500 → Used by NAT-T
Figure 78 CONFIGURATION > Service > Service Group
Go to CONFIGURATION > Security Policy > Policy Control, add corresponding
rule to allow L2TP services.
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