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Chapter 10 WAN
NBG6716 User’s Guide
76
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 49
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 NBG6716 supports both IGMP version 1
(
IGMP-v1
) and IGMP version 2 (
IGMP-v2
).
At start up, the NBG6716 queries all directly connected networks to gather group membership.
After that, the NBG6716 periodically updates this information. IP multicasting can be enabled/
disabled on the NBG6716 WAN interface in the Web Configurator (
WAN
). Select
None
to disable IP
multicasting on these interfaces.
10.4
Internet Connection
Use this screen to change your NBG6716’s Internet access settings. Click
Network
>
WAN
from
the
Configuration
menu. The screen differs according to the encapsulation you choose.
10.4.1
IPoE Encapsulation
This screen displays when you select
IPoE
encapsulation.
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Chapter 10 WAN
NBG6716 User’s Guide
77
Figure 50
Network > WAN > Internet Connection: IPoE Encapsulation
The following table describes the labels in this screen.
Table 27
Network > WAN > Internet Connection: IPoE Encapsulation
LABEL
DESCRIPTION
ISP Parameters for Internet Access
Encapsulation
You must choose the
IPoE
option when the WAN port is used as a regular Ethernet.
IP Address
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.
MTU Size
Enter the MTU (Maximum Transmission Unit) size for each packet. If a larger packet
arrives, the NBG6716 divides it into smaller fragments.
DNS Server
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Chapter 10 WAN
NBG6716 User’s Guide
78
10.4.2
PPPoE Encapsulation
The NBG6716 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 NBG6716 (rather than individual computers), the computers
on the LAN do not need PPPoE software installed, since the NBG6716 does that part of the task.
Furthermore, with NAT, all of the LANs’ computers will have access.
First DNS Server
Second DNS Server
Third DNS Server
Select
Obtained From ISP
if your ISP dynamically assigns DNS server information
(and the NBG6716'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 NBG6716’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 NBG6716.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 27
Network > WAN > Internet Connection: IPoE Encapsulation (continued)
LABEL
DESCRIPTION
Page 79 / 229
Chapter 10 WAN
NBG6716 User’s Guide
79
This screen displays when you select
PPPoE
encapsulation.
Figure 51
Network > WAN > Internet Connection: PPPoE Encapsulation
The following table describes the labels in this screen.
Table 28
Network > WAN > Internet Connection: PPPoE Encapsulation
LABEL
DESCRIPTION
ISP Parameters for Internet Access
Encapsulation
Select
PPPoE
if you connect to your Internet via dial-up.
PPP Information
PPP Username
Type the user name given to you by your ISP.
PPP Password
Type the password associated with the user name above.
MTU Size
Enter the Maximum Transmission Unit (MTU) or the largest packet size per frame that
your NBG6716 can receive and process.
PPP Auto Connect
Select this option if you do not want the connection to time out.
Idle Timeout
(second)
This value specifies the time in minutes that elapses before the router automatically
disconnects from the PPPoE server.
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Chapter 10 WAN
NBG6716 User’s Guide
80
10.5
Advanced WAN Screen
To change your NBG6716’s advanced WAN settings, click
Network
>
WAN
>
Advanced
. The
screen appears as shown.
PPPoE Service
Name
Enter the PPPoE service name specified in the ISP account.
WAN IP Address Assignment
Get automatically
from ISP
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.
My WAN IP
Address
Enter your WAN IP address in this field if you selected
Use Fixed IP Address
.
DNS Server
First DNS Server
Second DNS
Server
Third DNS Server
Select
Obtained From ISP
if your ISP dynamically assigns DNS server information (and
the NBG6716'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 using
the NBG6716’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 NBG6716.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 28
Network > WAN > Internet Connection: PPPoE Encapsulation (continued)
LABEL
DESCRIPTION

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