D-Link DSL-2640U Network Router User Manual


 
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When finished, click on Next to proceed to the NAT Settings screen.
Enable NAT: Select enable if you wish to share one WAN IP address for
multiple computers on your LAN.
Enable Firewall: Select if you wish to enable the router’s firewall for
security.
Enable IGMP Multicast: Select enable if you wish to be able to provide
multicasts, mostly used in video streaming.
Enable WAN Service: Select if you wish to use WAN service and then set
the service name.