Nat Forwarding; Translate Address And Port By Alg - TP-Link SR20 User Manual

Chapter 4
4. 4.

NAT Forwarding

The router's NAT (Network Address Translation) feature makes the devices in the LAN
use the same public IP address to communicate in the internet, which protects the
local network by hiding IP addresses of the devices. However, it also brings about the
problem that external host cannot initiatively communicate with the specified device
in the local network. With forwarding feature the router can penetrate the isolation of
NAT and allows the external hosts in the internet to initiatively communicate with the
devices in the local network, thus to realize some special functions.
It includes four forwarding rules. If two or more rules are set, the priority of implementation
from high to low is Virtual Servers, Port Triggering, UPNP and DMZ.
4. 4. 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 Kasa account.
2. Go to Advanced
• Enable FTP ALG: If enabled, it allows FTP (File Transfer Protocol) clients and servers to
transfer data via NAT.
• Enable TFTP ALG:
servers to transfer data via NAT.
> NAT Forwarding > ALG.
If enabled, it allows TFTP (Trivial File Transfer Protocol) clients and
Advanced Functions on Web Management Page
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