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Chapter 10
NAT Forwarding
10. 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://tplinkmodem.net, and log in with the password or your TP-Link ID.
2. Go to Advanced > NAT Forwarding > ALG.
Note:
It is recommended to keep the default settings.
• 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.
10. 2. Share Local Resources in the Internet by Virtual
Server
When you build up a server in the local network and want to share it on the internet,
Virtual Server can realize the service and provide it to the internet users. At the same
time virtual server can keep the local network safe as other services are still invisible
from the internet.
Virtual server can be used for setting up public services in your local network, such as
HTTP, FTP, DNS, POP3/SMTP and Telnet. Different service uses different service port.
Port 80 is used in HTTP service, port 21 in FTP service, port 25 in SMTP service and port
110 in POP3 service. Please verify the service port number before the configuration.
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