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Chapter 9
NAT Forwarding
9 4 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, H225 etc. Enabling ALG
is recommended.
Visit
http://tplinkmodem.net
, and log in with the password you set for the router. Go to
Advanced
>
NAT Forwarding
>
ALG
.
•
IPSec Passthrough:
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.
•
PPTP Passthrough:
If enabled, it allows Point-to-Point sessions to be tunneled through
an IP network and passed through the router.
•
Multicast ALG:
If enabled, it allows Multicast clients and servers to transfer data via
NAT.
•
UPnP ALG:
If enabled, it allows UPnP (Universal Plug and Play) clients and servers to
transfer data via NAT.
•
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.
•
H225 ALG:
If enabled, it allows H225 messages to be transferred via NAT.
