Aug 12

Note: This FAQ will demonstrate how to set up DNS relay so that a computer running on the LAN port can use the LAN IP of the D-Link firewall as a DNS server.

D-Link Netdefend firewall Details:

• LAN IP on firewall: 192.168.1.1
• Lannet on firewall: 192.168.1.0/24
• External DNS Server: 4.2.2.2

Step 1: Open the web browser and type the IP address of the firewall into the address bar (default is 192.168.1.1). Press Enter.

Step 2: Click on the plus sign next to Objects, select Address Book, and then select Interface Addresses.

Step 3: Click on Add and select IP address from the dropdown menu.

Step 4: Configure the D-Link DNS server address as followed:

• Name: Name as desired (dns_server in this example).
• IP Address: External DNS server address.

dlink-firewall-dns-relay-1

Click on OK.

Step 5: Click on the plus sign next to Rules and then select IP Rules.

Step 6: Click on Add and select IP Rule from the dropdown menu.

Step 7: Create the IP Rule as followed:

• Name: Name as desired
• Action: SAT
• Service: dns-all
• Schedule: None
• Source interface: lan
• Source network: lannet
• Destination interface: core
• Destination network: lan_ip

dlink-firewall-dns-relay-2

Step 8: Click on the SAT tab and under New IP Address select dns_server (as created in Step 4) from the dropdown menu.

dlink-firewall-dns-relay-3

Step 9: Click on Add to create another IP Rule and configure it as followed:

• Name: Name as desired
• Action: NAT
• Service: dns-all
• Schedule: None
• Source interface: lan
• Source network: lannet
• Destination interface: core
• Destination network: lan_ip

dlink-firewall-dns-relay-4

Note: If the environment is not NAT, then the action is Allow.

Step 10: Click on the Configuration tab and select Save and Activate from the dropdown menu. Click on OK to save and activate your changes.

Note: Make sure these two rules are triggered before any generic rules (e.g. allow_standard rules).And also, configure all PCs to have the firewall lan_ip (192.168.1.1) as DNS server.

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