Billion BiPAC 8700NEXL R2 User Manual page 105

IPoA
VPI/VCI: Enter the VPI/VCI 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 I P Filtering Incoming
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to add allowing rules.