D-Link NetDefendOS User Manual page 443

Network security firewall
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2.
Now enter:
Name: SAT-ftp-inbound
Action: SAT
Service: ftp-inbound-service
3.
For Address Filter enter:
Source Interface: any
Destination Interface: core
Source Network: all-nets
Destination Network: wan_ip (assuming the external interface has been defined as
this)
4.
For SAT check Translate the Destination IP Address
5.
Enter To: New IP Address: ftp-internal
6.
New Port: 21
7.
Click OK
D. Traffic from an internal interface needs to be NATed through the public IPv4 address:
1.
Go to: Policies > Firewalling > Main IP Rules > Add > IP Rule
2.
Now enter:
Name: NAT-ftp
Action: NAT
Service: ftp-inbound-service
3.
For Address Filter enter:
Source Interface: dmz
Destination Interface: core
Source Network: dmznet
Destination Network: wan_ip
4.
For NAT check Use Interface Address
5.
Click OK
E. Allow incoming connections (SAT requires an associated Allow rule):
1.
Go to: Policies > Firewalling > Main IP Rules > Add > IP Rule
2.
Now enter:
Name: Allow-ftp
443
Chapter 6: Security Mechanisms

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