Billion BiPAC 7800(N)X(L) User Manual page 119

IPoA
VCP/VPI: Enter the VCI/VPI combination from you ISP.
Encapsulation Mode: Select the encapsulation mode, LLC/SNAP-BRIDGING, or VC/MUX.
Description: User-defined description for the connection, commonly for friendly use.
WAN IP: Enter the WAN IP from the ISP.
WAN Subnet Mask: Enter the WAN Subnet Mask from the ISP.
NAT: The NAT (Network Address Translation) feature allows multiple users to access the Internet
through a single IP account by sharing the single IP address. If users on your LAN have their own
public IP addresses to access the Internet, NAT function can be disabled. When enabled, a Fullcone
NAT parameter will appear, you can determine whether to enable Fullcone NAT. While only NAT
enabled, the default NAT type Port-Restricted cone NAT will be used.
Fullcone NAT: Enable or disable fullcone NAT. Fullcone is a kind of NAT, in this mode, 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.
Firewall: Enable to drop all traffic from WAN side. If enabled, all incoming packets by default would
be dropped, and please turn to IP Filtering Incoming to add allowing rules.
IGMP Multicast: IGMP (Internet Group Membership Protocol) is a protocol used by IP hosts to
report their multicast group memberships to any immediately neighboring multicast routers. Check
this item to enable IGMP multicast on that WAN interface for multicast forwarding.
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