ZyXEL Communications ZyWALL 110 Handbook page 410

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3 Make sure the both ZyWALL/USG at the HQ and Branch sites security policies allow
IPSec VPN traffic. IKE uses UDP port 500, AH uses IP protocol 51, and ESP uses IP
protocol 50.
4 Default NAT traversal is enable on ZyWALL/USG, please make sure the remote
IPSec device must also have NAT traversal enabled.
5 Make sure the both ZyWALL/USG at the HQ and Branch sites use static IP address
because VPN Tunnel Interface does not support dynamic peer.
6 Make sure policy routes are configured to control traffic between the subnet of
HQ and Branch through VTI.
7 Make sure that the IP address of VTI at the Branch must be in the same subnet as
vti1 on HQ. For example, the IP address and subnet mask of vti1 on HQ is
10.10.10.10 and 255.255.255.0 respectively. The IP address of vti1 on the Branch
must be in the subnet of 10.10.10.0/24; the IP address and subnet mask of vti2 on
HQ is 10.10.11.10 and 255.255.255.0 respectively. The IP address of vti2 on the
Branch must be in the subnet of 10.10.10.0/24, and so on.
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