TP-Link TD-W9970 300Mbps Wireless N VDSL ADSL Modem Router User Guide

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Chapter 11  

NAT Forwarding  

11. 1. Translate Address and Port by ALG  

ALG (Application Layer Gateway) allows customized NAT (Network Address Translation)  

traversal filters to be plugged into the gateway to support address and port translation  

for certain application layer “control/data” protocols: FTP, TFTP, H323 etc. Enabling ALG  

is recommended.  

Visit http://tplinkmodem.net, and log in with your TP-Link ID or the password you set for  

the router. Go to Advanced > NAT Forwarding > ALG.  

• PPTP Pass-through: If enabled, it allows Point-to-Point sessions to be tunneled  

through an IP network and passed through the router.  

• L2TP Pass-through: If enabled, it allows Layer 2 Point-to-Point sessions to be tunneled  

through an IP network and passed through the router.  

• IPSec Pass-through: If enabled, it allows IPSec (Internet Protocol Security) to  

be tunneled through an IP network and passed through the router. IPSec uses  

cryptographic security services to ensure private and secure communications over  

IP networks.  

• FTP ALG: If enabled, it allows FTP (File Transfer Protocol) clients and servers to transfer  

data via NAT.  

• TFTP ALG: If enabled, it allows TFTP (Trivial File Transfer Protocol) clients and servers  

to transfer data via NAT.  

• H323 ALG: If enabled, it allows Microsoft NetMeeting clients to communicate via NAT.  

• SIP ALG: If enabled, it allows clients communicate with SIP (Session Initiation Protocol)  

servers via NAT.  

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General	Details
Name	TP-Link TD-W9970 300Mbps Wireless N VDSL ADSL Modem Router User Guide
Make	TP-Link
Language	English
Filetype	PDF (Download)
File size	2.17 MB

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