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5.4.1 Factory LAN Defaults
The LAN parameters of the ADSL Router are preset in the factory with the
following values:
IP address of 192.168.1.254 with subnet mask of 255.255.255.0 (24 bits)
DHCP server enabled with 100 client IP addresses starting from 192.168.1.100.
These parameters should work for the majority of installations. If your ISP gives
you explicit DNS server address(es), read the embedded web configurator help
regarding what fields need to be configured.
5.4.2 IP Address and Subnet Mask
Refer to the IP Address and Subnet Mask section in the Wizard Setup chapter for
this information.
5.4.3 RIP Setup
RIP (Routing Information Protocol) allows a router to exchange routing
information with other routers. The RIP
Direction
field controls the sending and
receiving of RIP packets. When set to:
1.
Both
- the ADSL Router will broadcast its routing table periodically and
incorporate the RIP information that it receives.
2.
In Only
- the ADSL Router will not send any RIP packets but will accept all RIP
packets received.
3.
Out Only
- the ADSL Router will send out RIP packets but will not accept any
RIP packets received.
4.
None
- the ADSL Router will not send any RIP packets and will ignore any RIP
packets received.
The
Dynamic Route
field controls the format and the broadcasting method of the
RIP packets that the ADSL Router sends (it recognizes both formats when
receiving). RIP-1 is universally supported; but RIP-2 carries more information.
RIP-1 is probably adequate for most networks, unless you have an unusual
network topology.
Both RIP-2B and RIP-2M sends the routing data in RIP-2 format; the difference
being that RIP-2B uses subnet broadcasting while RIP-2M uses multicasting.
5.4.4 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.
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.
IGMP version 2 (RFC 2236) is an improvement over version 1 (RFC 1112) but
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IGMP version 1 is still in wide use. If you would like to read more detailed
information about interoperability between IGMP version 2 and version 1, please
see sections 4 and 5 of RFC 2236. The class D IP address is used to identify host
groups and can be in the range 224.0.0.0 to 239.255.255.255. The address
224.0.0.0 is not assigned to any group and is used by IP multicast computers.
The address 224.0.0.1 is used for query messages and is assigned to the
permanent group of all IP hosts (including gateways). All hosts must join the
224.0.0.1 group in order to participate in IGMP. The address 224.0.0.2 is
assigned to the multicast routers group.
The ADSL Router supports both IGMP version 1 (IGMP-v1) and IGMP version 2
(IGMP-v2). At start up, the ADSL Router queries all directly connected networks
to gather group membership. After that, the ADSL Router periodically updates this
information. IP multicasting can be enabled/disabled on the ADSL Router LAN
and/or WAN interfaces in the web configurator (LAN; WAN). Select None to
disable IP multicasting on these interfaces.
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5.5 Configuring LAN
Click “
Interface Setup
”
then
“
LAN
” to open the following screen.
The following table describes the labels in this screen.
Router Local IP
IP Address
Enter the IP address of the ADSL Router in dotted decimal
notation, for example, 192.168.1.254 (factory default).
IP Subnet Mask
Type the subnet mask assigned to you by your ISP (if given).
RIP Direction
Select the RIP direction from None, Both, In Only and Out
Only.
RIP Version
Select the RIP version from RIP-1, RIP-2B and RIP-2M.
Multicast
IGMP (Internet Group Multicast Protocol) is a session-layer
protocol used to establish membership in a multicast group.
The ADSL Router supports both IGMP version 1 (IGMP-v1)
and IGMP-v2. Select None to disable it.
Save
Click this button to save these settings back to the ADSL
Router.
Cancel
Click this button to reset the fields in this screen.
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DHCP
Label
Description
DHCP
If set to
Enabled
, the ADSL Router can assign IP addresses,
an IP default gateway and DNS servers to Windows 95,
Windows NT and other systems that support the DHCP client.
If set to
Disabled
, the DHCP server will be disabled.
If set to
Relay
, the ADSL Router acts as a surrogate DHCP
server and relays DHCP requests and responses between the
remote server and the clients. Enter the IP address of the
actual, remote DHCP server in the Remote DHCP Server field
in this case.
When DHCP is used, the following items need to be set:
Starting
IP
Address
This field specifies the first of the contiguous addresses in the
IP address pool.
IP Pool count
This field specifies the size or count of the IP address pool.
Lease Time
This field specifies the length of time for the IP lease.
DNS Relay
If user want to disable this feature, he just need to set both
Primary and secondary DNS IP to 0.0.0.0. Using DNS relay,
users can setup DNS server IP to 192.168.1.1 on their
Computer. If not, device will perform as no DNS relay.
Primary DNS
Server
Enter the IP addresses of the DNS servers. The DNS servers
are passed to the
DHCP clients along with the IP address and the subnet mask.
Secondary DNS
Server
As above.
Save
Click this button to save these settings back to the ADSL
Router.
Cancel
Click this button to reset the fields in this screen.
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CHAPTER 6: WAN Setup
This chapter describes how to configure WAN settings.
6.1 WAN Overview
A WAN (Wide Area Network) is an outside connection to another network or the
Internet.
See the Wizard Setup chapter for more information on the fields in the WAN
screens.
6.2 PPPoE Encapsulation
The ADSL Router supports PPPoE (Point-to-Point Protocol over Ethernet).
PPPoE is an IETF Draft standard (RFC 2516) specifying how a personal
computer (PC) interacts with a broadband modem (DSL, cable, wireless, etc.)
connection. The PPPoE 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). PPPoE
provides a login and authentication method that the existing Microsoft Dial-Up
Networking software can activate, and therefore requires no new learning or
procedures for Windows users.
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 ADSL Router (rather than individual
computers), the computers on the LAN do not need PPPoE software installed,
since the ADSL Router does that part of the task. Furthermore, with NAT, all of the
LANs’ computers will have access.
6.3 PPTP Encapsulation
Point-to-Point Tunneling Protocol (PPTP) is a network protocol that enables
secure transfer 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.
6.4 Traffic Shaping
Traffic Shaping is an agreement between the carrier and the subscriber to
regulate the average rate and “burstiness” or fluctuation of data transmission over

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