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CONFIGURATION > Network > NAT > Add
Go to CONFIGURATION > Object > Address > Add, create an address object as the
ZyWALL/USU_HQ’s WAN IP address (in the example, 192.168.1.33).
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
CONFIGURATION > Service > Service Group