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41

personal computer interacts with a broadband modem (for example DSL, cable,

wireless, etc.) to achieve access to high-speed data networks.

For the service provider, PPPoE offers an access and authentication method that

works with existing access control systems (for instance, RADIUS).

One of the benefits of PPPoE is the ability to let end users 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 specific users.

Operationally, PPPoE saves significant effort for both the subscriber and the ISP/

carrier, as it requires no specific configuration of the broadband modem at the

subscriber’s site.

By implementing PPPoE directly on the NBG-416N (rather than individual

computers), the computers on the LAN do not need PPPoE software installed,

since the NBG-416N does that part of the task. Furthermore, with NAT, all of the

LAN's computers will have Internet access.

Figure 18

Wizard Step 3: PPPoE Connection

The following table describes the labels in this screen.

Table 12

Wizard Step 3: PPPoE Connection

LABEL

DESCRIPTION

ISP Parameter for Internet Access

Connection

Type

Select the

PPP over Ethernet

option for a dial-up connection.

Service Name

Type the name of your service provider.

User Name

Type the user name given to you by your ISP.

Password

Type the password associated with the user name above.

Back

Click

Back

to return to the previous screen.

Next

Click

Next

to continue.

Exit

Click

Exit

to close the wizard screen without saving.

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4.4.3

PPTP Connection

Point-to-Point Tunneling Protocol (PPTP) is a network protocol that enables

transfers of data from a remote client to a private server, creating a Virtual Private

Network (VPN) using TCP/IP-based networks.

PPTP supports on-demand, multi-protocol, and virtual private networking over

public networks, such as the Internet.

Refer to the appendix for more information on PPTP.

Note: The NBG-416N supports one PPTP server connection at any given time.

Figure 19

Wizard Step 3: PPTP Connection

The following table describes the fields in this screen

Table 13

Wizard Step 3: PPTP Connection

LABEL

DESCRIPTION

ISP Parameters for Internet Access

Connection Type

Select

PPTP

from the drop-down list box. To configure a PPTP client,

you must configure the

User Name

and

Password

fields for a PPP

connection and the PPTP parameters for a PPTP connection.

User Name

Type the user name given to you by your ISP.

Password

Type the password associated with the User Name above.

PPTP Configuration

Server IP

Address

Type the IP address of the PPTP server.

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4.4.4

Your IP Address

The following wizard screen allows you to assign a fixed IP address or give the

NBG-416N an automatically assigned IP address depending on your ISP.

Figure 20

Wizard Step 3: Your IP Address

The following table describes the labels in this screen

Connection ID/

Name

Enter the connection ID or connection name in this field. It must follow

the "c:id" and "n:name" format. For example, C:12 or N:My ISP.

This field is optional and depends on the requirements of your ISP.

Get

automatically

from ISP

Select this radio button if your ISP did not assign you a fixed IP

address.

Use fixed IP

address

Select this radio button, provided by your ISP to give the NBG-416N a

fixed, unique IP address.

My IP

Address

Type the (static) IP address assigned to you by your ISP.

My IP Subnet

Mask

Type the subnet mask assigned to you by your ISP (if given).

Back

Click

Back

to return to the previous screen.

Next

Click

Next

to continue.

Exit

Click

Exit

to close the wizard screen without saving.

Table 13

Wizard Step 3: PPTP Connection (continued)

LABEL

DESCRIPTION

Table 14

Wizard Step 3: Your IP Address

LABEL

DESCRIPTION

Get automatically from

your ISP

Select this option If your ISP did not assign you a fixed IP

address. This is the default selection. If you choose this option,

skip directly to

Section 4.4.9 on page 47

.

Use fixed IP address

provided by your ISP

Select this option if you were given IP address and/or DNS server

settings by the ISP. The fixed IP address should be in the same

subnet as your broadband modem or router.

Back

Click

Back

to return to the previous screen.

Next

Click

Next

to continue.

Exit

Click

Exit

to close the wizard screen without saving.

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4.4.5

WAN IP Address Assignment

Every computer on the Internet must have a unique IP address. If your networks

are isolated from the Internet, for instance, only between your two branch offices,

you can assign any IP addresses to the hosts without problems. However, the

Internet Assigned Numbers Authority (IANA) has reserved the following three

blocks of IP addresses specifically for private networks.

You can obtain your IP address from the IANA, from an ISP or have it assigned by

a private network. If you belong to a small organization and your Internet access

is through an ISP, the ISP can provide you with the Internet addresses for your

local networks. On the other hand, if you are part of a much larger organization,

you should consult your network administrator for the appropriate IP addresses.

Note: Regardless of your particular situation, do not create an arbitrary IP address;

always follow the guidelines above. For more information on address

assignment, please refer to RFC 1597, Address Allocation for Private Internets

and RFC 1466, Guidelines for Management of IP Address Space.

4.4.6

IP Address and Subnet Mask

Similar to the way houses on a street share a common street name, so too do

computers on a LAN share one common network number.

Where you obtain your network number depends on your particular situation. If

the ISP or your network administrator assigns you a block of registered IP

addresses, follow their instructions in selecting the IP addresses and the subnet

mask.

If the ISP did not explicitly give you an IP network number, then most likely you

have a single user account and the ISP will assign you a dynamic IP address when

the connection is established. The Internet Assigned Number Authority (IANA)

reserved this block of addresses specifically for private use; please do not use any

other number unless you are told otherwise. Let's say you select 192.168.1.0 as

the network number; which covers 254 individual addresses, from 192.168.1.1 to

192.168.1.254 (zero and 255 are reserved). In other words, the first three

numbers specify the network number while the last number identifies an individual

computer on that network.

Table 15

Private IP Address Ranges

10.0.0.0

-

10.255.255.255

172.16.0.0

-

172.31.255.255

192.168.0.0

-

192.168.255.255

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Once you have decided on the network number, pick an IP address that is easy to

remember, for instance, 192.168.1.1, for your NBG-416N, but make sure that no

other device on your network is using that IP address.

The subnet mask specifies the network number portion of an IP address. Your

NBG-416N will compute the subnet mask automatically based on the IP address

that you entered. You don't need to change the subnet mask computed by the

NBG-416N unless you are instructed to do otherwise.

4.4.7

DNS Server Address Assignment

Use DNS (Domain Name System) 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-416N 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, enter them

in the

DNS Server

fields in the

Wizard

and/or

WAN

> Internet Connection

screen.

2

If the ISP did not give you DNS server information, leave the

DNS Server

fields

set to

0.0.0.0

in the

Wizard

screen and/or set to

From ISP

in the

WAN

>

Internet Connection

screen for the ISP to dynamically assign the DNS server IP

addresses.