D-Link DSL-2740R User Manual page 28

Section 3 - Configuration
Type the PVC values which are from your ISP in VPI/VCI.
Select Enable NAT when you want to have WAN and LAN.
Select Enable Firewall when you want to have the basic filter function, for
example, ICMP ping to DSL-2740R.
Select Enable IGMP Proxy when you want to let IAD act as a IGMP proxy
which can help the proxy server to send IGMP query packets to the IPTV
clients.
Click on Apply to save the configuration.
D-Link DSL-2740R 28