TP-Link TD-W9970 TD-W9970 V1 User Guide - Page 55

Virtual Private Network VPN, Application Layer Gateway ALG

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TD-W9970 300Mbps Wireless N USB VDSL/ADSL Modem Router User Guide Figure 4-28  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.  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. • H323 ALG: To allow H323 clients and servers to transfer data across NAT, click Enable. • SIP ALG: To allow SIP clients and servers to transfer data across NAT, click Enable. Click the Save button to save your settings. 44

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TD-W9970
300Mbps Wireless N USB VDSL/ADSL Modem Router User Guide
44
Figure 4-28
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
.
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
.
•
H323 ALG:
To allow H323 clients and servers to transfer data across NAT, click
Enable
.
•
SIP ALG:
To allow SIP clients and servers to transfer data across NAT, click
Enable
.
Click the
Save
button to save your settings.