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Page 101 / 249 Scroll up to view Page 96 - 100
NBG6515 User’s Guide
101
C
HAPTER
13
WAN
13.1
Overview
This chapter discusses the NBG’s
WAN
screens. Use these screens to configure your NBG 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 77
LAN and WAN
13.2
What You Can Do
•
Use the
Internet Connection
screen (
Section 13.4 on page 103
) to enter your ISP information
and set how the computer acquires its IP, DNS and WAN MAC addresses.
•
Use the
Advanced
screen (
Section 13.5 on page 109
) to enable multicasting, configure Windows
networking and bridge.
13.3
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 NBG.
Router
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Chapter 13 WAN
NBG6515 User’s Guide
102
13.3.1
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 NBG, which makes it accessible from an outside
network. It is used by the NBG to communicate with other devices in other networks. It can be
static (fixed) or dynamically assigned by the ISP each time the NBG 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 NBG 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 NBG’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 13 WAN
NBG6515 User’s Guide
103
13.3.2
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 78
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 NBG supports both IGMP version 1
(
IGMP-v1
) and IGMP version 2 (
IGMP-v2
).
At start up, the NBG queries all directly connected networks to gather group membership. After
that, the NBG periodically updates this information. IP multicasting can be enabled/disabled on the
NBG LAN and/or WAN interfaces in the Web Configurator (
LAN
;
WAN
). Select
None
to disable IP
multicasting on these interfaces.
13.4
Internet Connection
Use this screen to change your NBG’s Internet access settings. Click
WAN
from the Configuration
menu. The screen differs according to the encapsulation you choose.
13.4.1
Ethernet Encapsulation
This screen displays when you select
Ethernet
encapsulation.
Router
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Chapter 13 WAN
NBG6515 User’s Guide
104
Figure 79
Network > WAN > Internet Connection: Ethernet Encapsulation
The following table describes the labels in this screen.
Table 51
Network > WAN > Internet Connection: Ethernet Encapsulation
LABEL
DESCRIPTION
ISP Parameters for Internet Access
Encapsulation
You must choose the
Ethernet
option when the WAN port is used as a regular Ethernet.
WAN IP Address Assignment
Get
automatically
from ISP
(Default)
Select this option If your ISP did not assign you a fixed IP address. This is the default
selection.
Use Fixed 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
Use Fixed IP Address
.
IP Subnet
Mask
Enter the
IP Subnet Mask
in this field.
Gateway IP
Address
Enter a
Gateway IP Address
(if your ISP gave you one) in this field.
MTU Size
Enter the Maximum Transmission Unit (MTU) or the largest packet size per frame that your
NBG can receive and process.
WAN DNS Assignment
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Chapter 13 WAN
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105
13.4.2
PPPoE Encapsulation
The NBG supports PPPoE (Point-to-Point Protocol over Ethernet). PPPoE is an IETF standard (RFC
2516) specifying how a personal computer (PC) interacts with a broadband modem (DSL, cable,
wireless, etc.) connection. The
PPP over Ethernet
option is for a dial-up connection using PPPoE.
For the service provider, PPPoE offers an access and authentication method that works with existing
access control systems (for example Radius).
One of the benefits of PPPoE is the ability to let you access one of multiple network services, a
function known as dynamic service selection. This enables the service provider to easily create and
offer new IP services for individuals.
Operationally, PPPoE saves significant effort for both you and the ISP or carrier, as it requires no
specific configuration of the broadband modem at the customer site.
By implementing PPPoE directly on the NBG (rather than individual computers), the computers on
the LAN do not need PPPoE software installed, since the NBG does that part of the task.
Furthermore, with NAT, all of the LANs’ computers will have access.
First DNS
Server
Second DNS
Server
Select
From ISP
if your ISP dynamically assigns DNS server information (and the NBG'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.
WAN MAC
Address
The MAC address section allows users to configure the WAN port's MAC address by either
using the NBG’s MAC address, copying the MAC address from a computer on your LAN or
manually entering a MAC address.
Factory default
Select
Factory default
to use the factory assigned default MAC Address.
Clone the
computer’s
MAC address -
IP Address
Select
Clone the computer's MAC address - IP Address
and enter the IP address of the
computer on the LAN whose MAC you are cloning.
Set WAN MAC
Address
Select this option and enter the MAC address you want to use.
Apply
Click
Apply
to save your changes back to the NBG.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 51
Network > WAN > Internet Connection: Ethernet Encapsulation (continued)
LABEL
DESCRIPTION

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