
GN-B41G Wireless Broadband Router 
The VPN Pass Through Tab A Virtual Private Network (VPN) is a type of secured private network connection, 
built upon publicly-accessible infrastructure such as the Internet. Typically, 
VPNs employ a certain combination of encryption, digital certificates, strict user 
authentication and access control to provide security to the data they deliver. 
They usually provide connectivity to various devices behind a gateway or 
firewall. 
The GN-B41G supports Internet-industry standard technologies to provide open 
and interoperable VPN solutions, including Internet Protocol Security (IPSec), 
Layer 2 Tunneling Protocol (L2TP) and Point-to-Point Tunneling Protocol 
(PPTP). 
 PPTP Pass Through setting 
Point-to-Point Tunneling Protocol (PPTP) allows you to establish a 
connection to an enterprise network. With PPTP, if your device is 
located within a local network, you can share files and other data. 
 IPSec Pass Through setting 
IP Security (IPSec) provides authentication and encryption. Since it is 
mainly a Layer 3 technology, it can secure all data on the network. It has 
become a standard protocol used with Virtual Private Networks (VPNs). 
 L2TP Pass Through setting 
Layer 2 Tunneling Protocol (L2TP) is an extension of the Point-to-Point 
Tunneling Protocol and is also used to establish virtual private networks. 
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