Chapter 36 Troubleshooting
USG20(W)-VPN Series User’s Guide
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You cannot set up a PPP interface, virtual Ethernet interface or virtual VLAN interface if the
underlying interface is a member of a bridge. You also cannot add an Ethernet interface or VLAN
interface to a bridge if the member interface has a virtual interface or PPP interface on top of it.
My rules and settings that apply to a particular interface no longer work.
The interface’s IP address may have changed. To avoid this create an IP address object based on
the interface. This way the USG automatically updates every rule or setting that uses the object
whenever the interface’s IP address settings change. For example, if you change LAN1’s IP address,
the USG automatically updates the corresponding interface-based, LAN1 subnet address object.
I cannot set up a PPP interface.
You have to set up an ISP account before you create a PPPoE or PPTP interface.
The data rates through my cellular connection are no-where near the rates I expected.
The actual cellular data rate you obtain varies depending on the cellular device you use, the signal
strength to the service provider’s base station, and so on.
I created a cellular interface but cannot connect through it.
• Make sure you have a compatible mobile broadband device installed or connected. See
www.zyxel.com for details.
• Make sure you have the cellular interface enabled.
• Make sure the cellular interface has the correct user name, password, and PIN code configured
with the correct casing.
• If the USG has multiple WAN interfaces, make sure their IP addresses are on different subnets.
Hackers have accessed my WEP-encrypted wireless LAN.
WEP is extremely insecure. Its encryption can be broken by an attacker, using widely-available
software. It is strongly recommended that you use a more effective security mechanism. Use the
strongest security mechanism that all the wireless devices in your network support. WPA2 or WPA2-
PSK is recommended.
Summary of Contents for ZyWall USG20-VPN
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