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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.

Chapter 10 WAN

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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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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

Chapter 10 WAN

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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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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