D-Link NetDefend DFL-210 User Manual page 214

6.2.3. The FTP ALG
To make it possible to connect to this server from the Internet using the FTP ALG, the FTP ALG and rules should
be configured as follows:
Web Interface
A. Define the ALG:
1. Go to Objects > ALG > Add > FTP ALG
2. Enter Name: ftp-inbound
3. Check Allow client to use active mode
4. Uncheck Allow server to use passive mode
5. Click OK
B. Define the Service:
1. Go to Objects > Services > Add > TCP/UDP Service
2. Enter the following:
• Name: ftp-inbound
• Type: select TCP from the list
• Destination: 21 (the port the FTP server resides on)
• ALG: select the "ftp-inbound" that has been created
3. Click OK
C. Define a rule to allow connections to the public IP on port 21 and forward that to the internal FTP server:
1. Go to Rules > IP Rules > Add > IPRule
2. Now enter:
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Chapter 6. Security Mechanisms