Asus DSL-X11 - Manual (Page 34)

DSL-X11 User Manual
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Enable NAT: Select it to enable the NAT functions of the modem. If you do not
want to enable NAT and wish the modem 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 Fullcone NAT: A full cone NAT is one where all requests from the same
internal IP address and port are mapped to the same external IP address and
port. Furthermore, any external host can send a packet to the internal host, by
sending a packet to the mapped external address.
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 active the PVC.
Click Next and the following page appears. This page shows all the
configuration.