ZyXEL Communications ZyWALL Troubleshooting Manual page 9

www.zyxel.com
 Verify that the device you are trying to contact across the VPN is
pointing to the ZyWALL for its default gateway. If the device is
pointing to a different default gateway the traffic will not get sent
back through the L2TP VPN tunnel.
 Verify the firmware is up to date and contact tech support for
further assistance. To check the current version of firmware on
the ZyWALL go to Maintenance  File Manager  Firmware
Package
9/26