ZyXEL Communications ZyWall ATP series - 10.6 The RIP Screen

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6. Make sure the ZyWALL/USG units’ security policies allow IPSec VPN traffic. IKE uses
UDP port 500, AH uses IP protocol 51, and ESP uses IP protocol 50.
7. Verify that the Zone is set correctly in the VPN Connection rule. This should be set to
IPSec_VPN Zone so that security policies are applied properly.
How to Import ZyWALL/USG Certificate for L2TP over IPsec in
Android mobile phone
This is an example of using the L2TP VPN and VPN client software included in Android
mobile phone operating systems. When the VPN tunnel is configured, users can
securely access the network behind the ZyWALL/USG and allow traffic from L2TP
clients to go to the Internet from an Android mobile phone.
ZyWALL/USG L2TP VPN with Remote Android Mobile Phone Client Example
Note: All network IP addresses and subnet masks are used as examples in this
article. Please replace them with your actual network IP addresses and subnet
masks. This example was tested using USG310 (Firmware Version: 4.25) and Android
(Version: 10.0.10240)