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What are the settings for configuring L2TP VPN on macOS 15 (Sequoia) using old USG/ZyWALL series?
Question: What are the settings for configuring L2TP/IPSec VPN on macOS 15 (Sequoia) using old USG/ZyWALL series? Answer: To configure L2TP VPN for macOS 15 (Sequoia) with the Zyxel USG40 and other USG/ZyWALL using firmware 4.73 patch 2, please follow these settings based on the successful configurations: Phase 1 (Gateway)…
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How to avoid unexpected routing issues when enabling both IPsec VPN and L2TP VPN simultaneously?
Scenario : The user may need to enable both IPsec VPN and L2TP VPN remote settings simultaneously. How can unexpected routing issues be avoided when enabling both IPsec VPN and L2TP VPN at the same time? Answer : STEP1. Navigate to Site-wide > Configure > Firewall > Remote access VPN STEP2.Please ensure their Client VPN…
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Why does the L2TP VPN not work on Windows 10 but works fine on Windows 11?
Question: Why does the L2TP VPN not work on Windows 10 but works fine on Windows 11? Answer: This issue can be related to certain Windows updates that interfere with VPN connections. Specifically, the patches KB5036893 and KB5036892 released by Microsoft have been known to break VPN functionality. Suggestion: To resolve…
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L2TP VPN doesn't work on Windows 10, but it works perfectly on Windows 11. What should I do?
Question My L2TP VPN on Nebula doesn't work on Windows 10, but it works perfectly on Windows 11. What should I do? Answer It looks like the issue you're experiencing is related to specific Windows updates on Windows 10. The patches KB5036893 and KB5036892 have been reported to break VPN connections. To resolve this issue,…
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[ATP/FLEX] Why am I unable to access the internal LAN network through the remote VPN?
Scenario : The user may encounter an awkward situation when successfully establishing a remote VPN connection (such as L2TP, IPsec VPN) but cannot access the internal LAN network resources. This article will outline possible reasons for this issue: Answer : To check the security policy if the remote VPN IP range can access…
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[ATP/FLEX] How can I check if the iPhone L2TP VPN connection has access to the internal LAN network?
Scenario : If you want to use the iphone L2TP VPN connection can access the internal LAN network, you can refer to this article. Answer : Once you establish L2TP successfully on the iPhone. Then you can navigate to Site-wide > Configure > Firewall > Interface to check the lan interface IP address. You can use a third-party…
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How can we check the Windows L2TP VPN connection log when troubleshooting a connection issue?
Question: How can we check the Windows L2TP VPN connection log when troubleshooting a connection issue? Answer: Press Win + X and select "Event Viewer" from the menu. In the Event Viewer window, expand "Windows Logs" in the left pane and select "Applicatoin." Filter the event log by the source "RasClient". You will be able…
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How to use L2TP VPN client to connect to an intranet PC using VNC software?
Background and Scenario: Sometimes, we might need to use the L2TP VPN client to connect to an intranet PC via VNC for handling some office tasks. Answer: Please refer to the below lab: Topology: (WAN:10.214.48.135) PC : L2TP client (192.168.50.1) => (WAN:10.214.48.25)USG Flex200 => LAN1=>PC :Ultra VNC server(192.168.1.121)…
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How to use CLI to check the current VPN connection status?
Background and Scenario: After establishing the site-to-site VPN and L2TP VPN connections, how can you use CLIs to check the current VPN connection status? Answer: You can use the commands "show sa monitor" and "show sa counter" to display the current VPN tunnel connection status and the number of VPN tunnels.
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Some PC can’t connect L2TP VPN if gateway is behind NAT
Root Cause: This is windows issue. Workaround: Log on to the Windows client computer as a user who is a member of the Administrators group. 1)Select Start > All Programs > Accessories > Run, type regedit, and then select OK. If the User Account Control dialog box is displayed on the screen and prompts you to elevate your…
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Implement Split Tunnel on Windows Client
Symptom: By default, when using the L2TP service, clients will go through a Full Tunnel. However, In certain situations, you may not want all traffic to go through the VPN tunnel Workaround: 1)Find the L2TP profiles in Control Panel->Network and Internet->Network Connections. Right-click it and go to properties >…
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How to setup L2TP VPN for remote access
The following is a sample configuration how to build up VPN tunnel with
the remote access VPN wizard. Remote access VPN Wizard is an easy way to quick set up VPN tunnel. Do
not need complex configuration to build up VPN tunnel, all you need is to
follow the steps on the VPN Wizard. Here are the steps to build L2TP over…
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How to configure L2TP VPN with Android Mobile Devices
The example instructs how to configure the VPN tunnel between each site. When the VPN tunnel is configured, each site can be accessed securely and allow traffic from L2TP clients to go to the Internet. Topology: Note: All network IP addresses and subnet masks are used as examples in this article. Please replace them with…
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How to access device WebGUI remotely via L2TP VPN tunnel
(1) Create VPN Gateway for L2TP (2) Create VPN connection for L2TP (3) Setup L2TP VPN setting (4) Create policy route for Intranet/Internet routing Since client already built L2TP VPN tunnel, so all of traffic will pass into VPN tunnel. So you can access device WebGUI by any activated interface IP address. You can check…
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How to setup L2TP VPN
Setup L2TP VPN configuration on USG (1) Create VPN Gateway for L2TP (2) Create VPN connection for L2TP (3) Setup L2TP VPN setting (4) Create policy route for Intranet/Internet routing
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How to forward traffic to branch site server after client established VPN tunnel
Scenario: Site#A and SiteB are established site to site VPN tunnel. How to forward traffic to Site#B after client connected VPN tunnel to Site#A. VPN client can be L2TP/SSL VPN/ IPSec VPN. Client will get the IP address which assigned by Site#A router. In this scenario, VPN client got IP 10.10.10.1 after established L2TP…
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How to configure L2TP on ZyWALL
Go to Configuration > VPN > IPSec VPN > VPN Gateway > Click "Add" button to add L2TP VPN phase 1. Go to Configuration > VPN > IPSec VPN > VPN Connection and click add button to add L2TP VPN phase 2. Go to Configuration > VPN > L2TP to configure your L2TP address setting.
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How to establish L2TP tunnel from LAN side
Topology: Background: The VPN is a popular function for
encrypting packets when transmitting the data. In ZyWALL/USG/ATP’s current design, when
the VPN interface is based on WAN1 interface, VPN request must coming from WAN1
interface (interface restricted), otherwise the request will be denied. (e.g.
VPN connection came…
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How to configure AD User do the authentication on L2TP scenario
Step1. First, build up L2TP VPN configuration as below: Step2. Set AD domain and Members on the Windows Server 2012, please refer to picture below: Step3. Add user name and configure Group Identifier: CN=L2TP_VPN_Access,OU=Security Groups,OU=MyCompany,DC=test,DC=local, please refer to setting below: Please note: After…
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How do you configure L2TP VPN between ZyWALL and a Windows 7 laptop?
This example focuses on how to configure L2TP VPN in Windows 7. Please refer to the User Guide of ZLD serial device for the relative settings in creating a L2TP VPN tunnel in ZyWALL. Configure L2TP on Windows 7 Step 1. Step 2. Step 3. Choose "No, create a new connection". Step 4. Choose “Use my Internet connection (VPN)”.…