Alg Settings - TP-Link TD-W9970 User Manual


Note:
Only the WAN Ports can use MA C Address Clone function. All the clone MAC addresses must not be
the same with each other.

4.4.7 ALG Settings

Go to Network ALG
→
shown below.
Virtual Private Network (VPN):

tunnels using VPN protocols to pass through the modem router.
PPTP Passthrough:
•
Protocol (PPP) to be tunneled through an IP network. To allow PPTP tunnels to pass
through the modem router, click Enable.
L2TP Passthrough:
•
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:
•
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):

(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.
•
Settings, and then you can configure the basic security in the screen as
VPN Passthrough must be enabled if you want to allow VPN
Point-to-Point Tunneling Protocol (PPTP) allows the Point-to-Point
Layer Two Tunneling Protocol (L2TP) is the method used to enable
Internet Protocol security (IPSec) is a suite of protocols for ensuring
It is recommended to enable Application Layer Gateway
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TD-W9970 User Guide