ZyXEL Communications ZyWALL USG 20 User Manual page 26

Step 7. Configure the rule to:
- Allow access from WAN to LAN1
- Source IP address is not specific
- Destination IP address is the FTP server's address
- Select FTP service (with port 20/21) to be enabled
- Select the allow action for matched packets
After this configuration, user can access the FTP server from WAN side.
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– ZyWALL USG Support Notes
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