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NBG6817 User’s Guide
71
C
HAPTER
10
WAN
10.1
Overview
This chapter discusses the NBG6817’s
WAN
screens. Use these screens to configure your NBG6817
for Internet access.
A WAN (Wide Area Network) connection is an outside connection to another network or the
Internet. It connects your private networks such as a LAN (Local Area Network) and other
networks, so that a computer in one location can communicate with computers in other locations.
Figure 51
LAN and WAN
10.2
What You Can Do
•
Use the
Internet Connection
screen to enter your ISP information and set how the computer
acquires its IP, DNS and WAN MAC addresses (
Section 10.4 on page 74
).
•
Use the
NAT > General
screen to enable NAT, set a default server and change your NBG6817’s
port forwarding settings (
Section 10.5.1 on page 86
).
•
Use the
NAT > Port Trigger
screen to configure your NBG6817’s trigger port settings (
Section
10.5.2 on page 88
).
•
Use the
NAT > Passthrough
screen to configure your NBG6817’s ALGs and VPN pass-through
settings (
Section 10.5.3 on page 88
).
•
Use the
Dynamic
DNS
screen to change your NBG6817’s DDNS settings (
Section 10.6 on page
90
).
10.3
What You Need To Know
The information in this section can help you configure the screens for your WAN connection, as well
as enable/disable some advanced features of your NBG6817.
Page 72 / 209
Chapter 10 WAN
NBG6817 User’s Guide
72
10.3.1
Configuring Your Internet Connection
Encapsulation Method
Encapsulation is used to include data from an upper layer protocol into a lower layer protocol. To set
up a WAN connection to the Internet, you need to use the same encapsulation method used by your
ISP (Internet Service Provider). If your ISP offers a dial-up Internet connection using PPPoE (PPP
over Ethernet) or PPTP (Point-to-Point Tunneling Protocol), they should also provide a username
and password (and service name) for user authentication.
WAN IP Address
The WAN IP address is an IP address for the NBG6817, which makes it accessible from an outside
network. It is used by the NBG6817 to communicate with other devices in other networks. It can be
static (fixed) or dynamically assigned by the ISP each time the NBG6817 tries to access the
Internet.
If your ISP assigns you a static WAN IP address, they should also assign you the subnet mask and
DNS server IP address(es) (and a gateway IP address if you use the Ethernet or ENET ENCAP
encapsulation method).
DNS Server Address Assignment
Use Domain Name System (DNS) to map a domain name to its corresponding IP address and vice
versa, for instance, the IP address of www.zyxel.com is 204.217.0.2. The DNS server is extremely
important because without it, you must know the IP address of a computer before you can access
it.
The NBG6817 can get the DNS server addresses in the following ways.
1
The ISP tells you the DNS server addresses, usually in the form of an information sheet, when you
sign up. If your ISP gives you DNS server addresses, manually enter them in the DNS server fields.
2
If your ISP dynamically assigns the DNS server IP addresses (along with the NBG6817’s WAN IP
address), set the DNS server fields to get the DNS server address from the ISP.
WAN MAC Address
The MAC address screen allows users to configure the WAN port's MAC address by either using the
factory default or cloning the MAC address from a computer on your LAN. Choose
Factory Default
to select the factory assigned default MAC Address.
Otherwise,
click
Clone the computer's MAC address - IP Address
and enter the IP address of
the computer on the LAN whose MAC you are cloning. Once it is successfully configured, the
address will be copied to configuration file. It is recommended that you clone the MAC address prior
to hooking up the WAN Port.
Page 73 / 209
Chapter 10 WAN
NBG6817 User’s Guide
73
Multicast
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1 recipient)
or Broadcast (1 sender - everybody on the network). Multicast delivers IP packets to a group of
hosts on the network - not everybody and not just 1.
Figure 52
Multicast Example
In the multicast example above, systems A and D comprise one multicast group. In multicasting,
the server only needs to send one data stream and this is delivered to systems A and D.
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish membership
in a multicast group - it is not used to carry user data. The NBG6817 supports both IGMP version 1
(
IGMP-v1
) and IGMP version 2 (
IGMP-v2
).
At start up, the NBG6817 queries all directly connected networks to gather group membership.
After that, the NBG6817 periodically updates this information. IP multicasting can be enabled/
disabled on the NBG6817 WAN interface in the Web Configurator (
WAN
). Select
None
to disable IP
multicasting on these interfaces.
Auto-IP Change
When the NBG6817 gets a WAN IP address or a DNS server IP address which is in the same subnet
as the LAN IP address 192.168.1.1, Auto-IP-Change allows the NBG6817 to change its LAN IP
address to 10.0.0.1 automatically. If the NBG6817’s original LAN IP address is 10.0.0.1 and the
WAN IP address is in the same subnet, such as 10.0.0.3, the NBG6817 switches to use 192.168.1.1
as its LAN IP address.
Figure 53
Auto-IP-Change Example
192.168.1.1
192.168.1.23
10.0.0.1
Page 74 / 209
Chapter 10 WAN
NBG6817 User’s Guide
74
Auto-IP-Change only works under the following conditions:
•
The NBG6817 must be in
Router Mode
(see
Section 15.12 on page 158
for more information)
for Auto-IP-Change to become active.
•
The NBG6817 is set to receive a dynamic WAN IP address.
10.4
Internet Connection Screen
Use this screen to change your NBG6817’s Internet access settings. Click
Expert
Mode
>
WAN
>
Internet Connection
.
10.4.1
IPoE Encapsulation
This screen displays when you select
IPoE
encapsulation.
Page 75 / 209
Chapter 10 WAN
NBG6817 User’s Guide
75
Figure 54
Expert Mode > WAN > Internet Connection: IPoE Encapsulation (IPv4 Only)

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