D-Link DSL-2740B

Section 3 - Configuration
D-Link DSL-2740B User Manual
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NETWORK ADDRESS TRANSLATION SETTINGS
Enable the NAT and Firewall which are recommended by default.
Enable the IGMP Multicast if user needs IPTV related application.
Click on the Next button to go to the next window.
DNS Server Configuration
Select Obtain DNS Server address automatically to get DNS IP
address automatically, or type the Preferred and Alternate DNS server
IP Address manually.
Click on the Next button to go to the next window.