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Page 67 / 252
NBG5715 User’s Guide
67
C
HAPTER
10
WAN
10.1
Overview
This chapter discusses the NBG5715’s
WAN
screens. Use these screens to configure your NBG5715
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 37
LAN and WAN
10.2
What You Can Do in this Chapter
•
Use the
Broadband
screen to enter your ISP information and set how the computer acquires its
IP, DNS and WAN MAC addresses (
Section 10.4 on page 69
).
•
Use the
Advanced
screen to enable multicasting (
Section 10.5 on page 72
).
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 NBG5715.
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
Page 68 / 252
Chapter 10 WAN
NBG5715 User’s Guide
68
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 NBG5715, which makes it accessible from an outside
network. It is used by the NBG5715 to communicate with other devices in other networks. It can be
static (fixed) or dynamically assigned by the ISP each time the NBG5715 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 NBG5715 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 NBG5715’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.
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Chapter 10 WAN
NBG5715 User’s Guide
69
10.3.2
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 38
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 NBG5715 supports both IGMP version 1
(
IGMP-v1
) and IGMP version 2 (
IGMP-v2
).
At start up, the NBG5715 queries all directly connected networks to gather group membership.
After that, the NBG5715 periodically updates this information. IP multicasting can be enabled/
disabled on the NBG5715 LAN and/or WAN interfaces in the Web Configurator (
LAN
;
WAN
). Select
None
to disable IP multicasting on these interfaces.
10.4
The Broadband Screen
Use this screen to change your NBG5715’s Internet access settings. Click
Configuration >
Network > WAN
to open the
Broadband
screen. The screen differs according to the
encapsulation you choose.
10.4.1
Ethernet Encapsulation
This screen displays when you select
ENET ENCAP
(Ethernet encapsulation).
Page 70 / 252
Chapter 10 WAN
NBG5715 User’s Guide
70
Figure 39
Network > WAN > Broadband: ENET ENCAP
The following table describes the labels in this screen.
Table 24
Network > WAN > Broadband: ENET ENCAP
LABEL
DESCRIPTION
ISP Parameters for Internet Access
Encapsulation
Choose the
ENET ENCAP
(Ethernet encapsulation) option when the WAN port is
used as a regular Ethernet.
Obtain an IP
Address
Automatically
Select this option If your ISP did not assign you a fixed IP address. This is the
default selection.
Static IP Address
Select this option If the ISP assigned a fixed IP address.
IP Address
Enter your WAN IP address in this field if you selected
Static IP Address
.
Subnet Mask
Enter the
Subnet Mask
in this field.
Gateway IP
Address
Enter a
Gateway IP Address
(if your ISP gave you one) in this field.
First DNS Server
Second DNS
Server
Select
Obtained From ISP
if your ISP dynamically assigns DNS server
information (and the NBG5715's WAN IP address). The field to the right displays
the (read-only) DNS server IP address that the ISP assigns.
Select
User-Defined
if you have the IP address of a DNS server. Enter the DNS
server's IP address in the field to the right. If you chose
User-Defined
, but
leave the IP address set to 0.0.0.0,
User-Defined
changes to
None
after you
click
Apply
. If you set a second choice to
User-Defined
, and enter the same IP
address, the second
User-Defined
changes to
None
after you click
Apply
.
Select
None
if you do not want to configure DNS servers. If you do not
configure a DNS server, you must know the IP address of a computer in order to
access it.
Apply
Click
Apply
to save your changes back to the NBG5715.
Cancel
Click
Cancel
to begin configuring this screen afresh.

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