D-Link DFL-260E User Manual for DFL-260E - Page 277
Example 6.3. Protecting FTP Clients, A. Create the FTP ALG
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6.2.3. The FTP ALG Chapter 6. Security Mechanisms 3. For Address Filter enter: • Source Interface: any • Destination Interface: core • Source Network: all-nets • Destination Network: wan_ip 4. Click OK Example 6.3. Protecting FTP Clients In this scenario shown below the NetDefend Firewall is protecting a workstation that will connect to FTP servers on the Internet. In this case, we will set the FTP ALG restrictions as follows. • Disable the Allow client to use active mode FTP ALG option so clients can only use passive mode. This is much safer for the client. • Enable the Allow server to use passive mode FTP ALG option. This allows clients on the inside to connect to FTP servers that support active and passive mode across the Internet. The configuration is performed as follows: Web Interface A. Create the FTP ALG (The ALG ftp-outbound is already predefined by NetDefendOS but in this example we will show how it can be created from scratch.) 277
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