150Mbps Wireless AP/Client Router User Guide
37
Figure 4-17
¾ Virtual Private Network (VPN) - VPN Passthrough must be enabled if you want to allow
VPN tunnels using VPN protocols to pass through the Modem Router.
• PPTP Passthrough - Point-to-Point Tunneling Protocol (PPTP) allows the
Point-to-Point Protocol (PPP) to be tunneled through an IP network. To allow PPTP
tunnels to pass through the Modem Router, click Enable.
• L2TP Passthrough - Layer Two Tunneling Protocol (L2TP) is the method used to
enable Point-to-Point sessions via the Internet on the Layer Two level. To allow L2TP
tunnels to pass through the Modem Router, click Enable.
• IPSec Passthrough - Internet Protocol security (IPSec) is a suite of protocols for
ensuring private, secure communications over Internet Protocol (IP) networks, through
the use of cryptographic security services. To allow IPSec tunnels to pass through the
Modem Router, click Enable.
¾ Application Layer Gateway (ALG) - It is recommended to enable Application Layer
Gateway (ALG) because ALG allows customized Network Address Translation (NAT)
traversal filters to be plugged into the gateway to support address and port translation for
certain application layer "control/data" protocols such as FTP, TFTP etc.
• FTP ALG - To allow FTP clients and servers to transfer data across NAT, click Enable.
• TFTP ALG - To allow TFTP clients and servers to transfer data across NAT, click
Enable.
Click the Save button to save your settings.
4.4.7 DSL Settings
Choose “Advanced Setup”Æ“DSL Settings”, you can select the DSL Modulation Type and
Annex Type in the next screen. The DSL feature can be selected when you meet the physical
connection problem. Please check the proper settings with your Internet service provider.
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