Billion BiPAC 7800(N)X(L) User Manual page 118

Option 125: Option 125 is a complementary standard of DHCP protocol, it is used to encapsulate
option 125 message into DHCP offer packet before forward it to clients. After the clients receive the
packet, it check the option 125 field in the packet with the prestored message, if it is matched, then
the client accepts this offer, otherwise it will be abandoned. Check Enable or Disable this function.
Default setting is Disable.
WAN IP Address: Enter your IPv4 address to the device provided by your ISP.
WAN Subnet Mask: Enter your submask to the device provided by your ISP.
WAN gateway IP Address: Enter your gateway IP address to the device provided by your ISP.
IPv6 for this service: Enable to use IPv6 service.
Obtain an IPv6 address automatically: check whether to enable or disable this feature.
WAN IPv6 Address/Prefix Length: Enter the WAN IPv6 Address/Prefix Length from your ISP.
WAN Next-Hop IPv6 Address: Enter the WAN Next-Hop IPv6 Address from your ISP.
Note: If you don't know well about the DHCP Option, you can leave it empty or leave it as default.
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.
MLD Multicast Proxy: check whether to enable this function. MLD (Multicast Listener Discovery
Protocol) Proxy intercepts the MLD request from Clients a set up the multicast-forwarding table. it
takes over some of the router's job, simplifying the router's job and multicast communication.
Support MLDv1 and MLDv2.
Click Next to continue to set the default gateway and DNS for IPv4 and IPv6.
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