Chapter 10 ALG
USG FLEX H Series User’s Guide
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FTP ALG
File Transfer Protocol (FTP) is an Internet file transfer service that operates on the Internet and over TCP/IP
networks. A system running the FTP server accepts commands from a system running an FTP client. The
service allows users to send commands to the server for uploading and downloading files.
The FTP ALG allows TCP packets with a specified port destination to pass through. If the FTP server is
located on the LAN, you must also configure NAT (port forwarding) and security policies if you want to
allow access to the server from the WAN.
10.1.2 Before You Begin
You must also configure the security policy and enable NAT in the Zyxel Device to allow sessions initiated
from the WAN.
10.2 The ALG Screen
Click Network > ALG to open the ALG screen. Use this screen to:
• Turn ALGs off or on.
• Configure the port numbers to which they apply.
Note: If the Zyxel Device provides an ALG for a service, you must enable the ALG in order to
use the application patrol on that service’s traffic.
Figure 111 Network > ALG
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