In order to connect to a VPN from a VPN client that's connected to the TG862, VPN traffic will need to be allowed to pass through the TG862 in order to establish the VPN connection. By default, VPN passthrough is enabled. This document describes how to allow IPsec VPN, PPTP VPN, or L2TP VPN traffic to pass through the TG862 to a VPN client.
To Enable VPN Passthrough
Launch a web browser, such as Internet Explorer, Firefox, or Safari. Enter http://192.168.0.1 into the address box, and press the Enter key. The Login page appears.
NOTE: By default the LAN IP address is 192.168.0.1. If the default address has been changed, enter the custom address in the address box.
On the Login page:
a. Enter admin in the Username field.
b. Enter password in the Password field.
c. Click the Login button. The System Basic Setup page appears.
On the top menu, click the Firewall tab. The Firewall Settings page appears.
On the Firewall Settings page:
a. Enable IPsec Passthrough - Check the checkbox if it is desired to connect with an IPsec client.
b. Enable PPTP Passthrough - Check the checkbox if it is desired to connect with a PPTP client.
c. Enable L2TP Passthrough - Check the checkbox if it is desired to connect with an L2TP client.
NOTE: A restart is not required for these settings to take effect.