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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.
1. Visit http://tplinkwifi.net, and log in with your TP-Link ID or the password you set for
the router.
2. Go to Advanced > NAT Forwarding > ALG.
Note: It is recommended to keep the default settings.
• Enable FTP ALG: If enabled, it allows FTP (File Transfer Protocol) clients and servers to
transfer data via NAT.
• Enable TFTP ALG: If enabled, it allows TFTP (Trivial File Transfer Protocol) clients and
servers to transfer data via NAT.
• Enable H323 ALG: If enabled, it allows Microsoft NetMeeting clients to communicate
via NAT.
• Enable RTSP ALG: If enabled, it allows RTSP (Real-Time Stream Protocol) clients and
servers to transfer data via NAT.
• Enable SIP ALG: If enabled, it allows clients communicate with SIP (Session Initiation
Protocol) servers via NAT.
• Enable PPTP Pass-through: If enabled, it allows Point-to-Point sessions to be tunneled
through an IP network and passed through the router.
• Enable 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.
• Enable 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
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