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56

8.3.1

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 EMG2926-Q10A, which makes it accessible from an

outside network. It is used by the EMG2926-Q10A to communicate with other devices in other

networks. It can be static (fixed) or dynamically assigned by the ISP each time the EMG2926-Q10A

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 EMG2926-Q10A 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 EMG2926-Q10A’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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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 26

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 EMG2926-Q10A supports both IGMP

version 1 (

IGMP-v1

) and IGMP version 2 (

IGMP-v2

).

At start up, the EMG2926-Q10A queries all directly connected networks to gather group

membership. After that, the EMG2926-Q10A periodically updates this information. IP multicasting

can be enabled/disabled on the EMG2926-Q10A WAN interface in the Web Configurator (

WAN

).

Select

None

to disable IP multicasting on these interfaces.

8.4

Internet Connection

Use this screen to change your EMG2926-Q10A’s Internet access settings. Click

Network

>

WAN

from the

Configuration

menu. The screen differs according to the encapsulation you choose.

8.4.1

IPoE Encapsulation

This screen displays when you select

IPoE

encapsulation.

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Figure 27

Network > WAN > Internet Connection: IPoE Encapsulation (IPv4 Only)

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The following table describes the labels in this screen.

Table 14

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.

IPv4 / IPv6

Select

IPv4 Only

if you want the EMG2926-Q10A to run IPv4 only.

Select

Dual Stack

to allow the EMG2926-Q10A to run IPv4 and IPv6 at the same time.

Select

IPv6 Only

if you want the EMG2926-Q10A to run IPv6 only.

IP Address

This is not available when you select

IPv6 Only

in the

IPv6/IPv4

field.

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 EMG2926-Q10A divides it into smaller fragments.

DHCP Option

This is not available when you select

IPv6 Only

in the

IPv6/IPv4

field.

Enable DHCP Option

121

Select this to enable the classless route option 121.

Enable DHCP Option

125

Select this to add vendor specific information to DHCP requests that the EMG2926-

Q10A sends to a DHCP server when getting a WAN IP address.

Enable DHCP Option

60

Select this to identify the vendor and functionality of the EMG2926-Q10A in DHCP

requests that the EMG2926-Q10A sends to a DHCP server when getting a WAN IP

address.

Vendor ID

Enter the Vendor Class Identifier (Option 60), such as the type of hardware or

firmware.

6RD

Use IPv6 Rapid Deployment (6rd) when the local network uses IPv6 and the ISP has an IPv4 network. When

the EMG2926-Q10A has an IPv4 WAN address and you set IPv6/IPv4 mode to

IPv4 Only

, you can enable 6rd

to encapsulate IPv6 packets in IPv4 packets to cross the ISP’s IPv4 network.

The EMG2926-Q10A generates a global IPv6 prefix from its IPv4 WAN address and tunnels IPv6 traffic to the

ISP’s Border Relay router to connect to the native IPv6 Internet. The local network can also use IPv4 services.

The EMG2926-Q10A uses its configured IPv4 WAN IP to route IPv4 traffic to the IPv4 Internet.

This is available only when you select

IPv4 Only

in the

IPv6/IPv4

field.

Enable 6RD

Enable IPv6 rapid deployment to tunnel IPv6 traffic from the local network through the

ISP’s IPv4 network.

Automatically

configured by

DHCPC

Select this to have the EMG2926-Q10A detect the relay server’s IP address

automatically through DHCP.

Manually Configured

Select this if you have the IPv4 address of the relay server.

Border Relay IPv4

Address

Specify the relay server’s IPv4 address.

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Service Provider

IPv6 Prefix

Enter an IPv6 prefix for tunneling IPv6 traffic to the ISP’s Border Relay router and

connecting to the native IPv6 Internet.

Service Provider

IPv6 Prefix length

Enter the IPv6 prefix length.

An IPv6 prefix length specifies how many most significant bits (starting from the left) in

the address compose the network address.

IPv4 mask length

Enter the subnet mask number (1~32) for the IPv4 network.

DNS Server

This is not available when you select

IPv6 Only

in the

IPv6/IPv4

field.

First DNS Server

Second DNS Server

Third DNS Server

Select

Obtained From ISP

if your ISP dynamically assigns DNS server information

(and the EMG2926-Q10A'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.

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 EMG2926-Q10A’s MAC address, copying the MAC address from a

computer on your LAN or manually entering a MAC address.

This is not available when you select

IPv6 Only

in the

IPv6/IPv4

field.

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.

IPv6 Address

This is not available when you select

IPv4 Only

in the

IPv6/IPv4

field.

Obtain an IP

Address

Automatically

Select this if you want to obtain an IPv6 address from a DHCPv6 server.

Static IP Address

Select this if you have a fixed IPv6 address assigned by your ISP.

IPv6 Address

Enter the IPv6 address assigned by your ISP.

Prefix length

Enter the address prefix length to specify how many most significant bits in an IPv6

address compose the network address.

IPv6 Default

Gateway

Enter the IP address of the next-hop gateway. The gateway is a router or switch on the

same segment as your EMG2926-Q10A's interface(s). The gateway helps forward

packets to their destinations.

IPv6 DNS server

This is not available when you select

IPv4 Only

in the

IPv6/IPv4

field.

Obtain IPv6 DNS

info Automatically

Select this to have the EMG2926-Q10A get the IPv6 DNS server addresses from the ISP

automatically.

Use the following

Static DNS IPv6

Address

Select this to have the EMG2926-Q10A use the IPv6 DNS server addresses you

configure manually.

IPv6 DNS Server

Enter the IPv6 DNS server address assigned by the ISP.

Table 14

Network > WAN > Internet Connection: IPoE Encapsulation (continued)

LABEL

DESCRIPTION