Ovislink OV804WV User Manual page 83

Use the following DNS server addesses: if you want to
manually enter the IP address of the DNS server, select this
check box and enter the information in the fields.
Primary DNS server: enter the IP address of the primary DNS
server.
Secondary DNS server: enter the IP address of the secondary
DNS server provided by your ISP.
After proper modifications, click Next and the following page
appears. In this page, you can modify the service name, and
enable or disable the NAT, firewall, IGMP multicast, and WAN
service.
Figure 64 IPoA IGMP and WAN service
Enable NAT: select it to enable the NAT functions of the DSL
Router. If you do not want to enable NAT and wish the DSL
Router user to access the Internet normally, you must add a
route on the uplink equipment. Otherwise, the access to the
Internet fails. Normally, NAT should be enabled.
Enable Firewall: enable or disable IP filtering.
IGMP Multicast: IGMP proxy. For example, if you wish that the
IPoA mode supports IPTV, enable this function.
WAN Service: enable it, unless you do not want to activate the
PVC.
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