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Chapter 12 ALG
12.2 ALG
Click Configuration > Network > ALG to open this screen. Use this screen to turn the ALG off or
on, configure the port numbers to which it applies.
Figure 74 Configuration > Network > ALG
The following table describes the labels in this screen.
Table 69 Configuration > Network > ALG
LABEL
Enable FTP ALG
Enable FTP
Transformations
FTP Signaling Port
Additional FTP
Signaling Port for
Transformations
Apply
Reset
12.3 Technical Reference
The following section contains additional technical information about the features described in this
chapter.
FTP
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.
148
DESCRIPTION
Turn on the FTP ALG to detect FTP (File Transfer Program) traffic and help build FTP
sessions through the NXC's NAT.
Select this option to have the NXC modify IP addresses and port numbers embedded in
the FTP data payload to match the NXC's NAT environment.
Clear this option if you have an FTP device or server that will modify IP addresses and
port numbers embedded in the FTP data payload to match the NXC's NAT environment.
If you are using a custom TCP port number (not 21) for FTP traffic, enter it here.
If you are also using FTP on an additional TCP port number, enter it here.
Click Apply to save your changes back to the NXC.
Click Reset to return the screen to its last-saved settings.
NXC2500 User's Guide
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Troubleshooting
