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There are two ways that an ISP disseminates the DNS server addresses. The first is
for an ISP to tell a customer the DNS server addresses, usually in the form of an
information sheet, when s/he signs up. If your ISP gives you the DNS server
addresses, enter them in the DNS Server fields in DHCP Setup, otherwise, leave
them blank.
Some ISP’s choose to pass the DNS servers using the DNS server extensions of PPP
IPCP (IP Control Protocol) after the connection is up. If your ISP did not give you
explicit DNS servers, chances are the DNS servers are conveyed through IPCP
negotiation. The ADSL Router supports the IPCP DNS server extensions through the
DNS proxy feature.
If the Primary and Secondary DNS Server fields in DHCP Setup are not specified, for
instance, left as 0.0.0.0, the ADSL Router tells the DHCP clients that it itself is the
DNS server. When a computer sends a DNS query to the ADSL Router, the ADSL
Router forwards the query to the real DNS server learned through IPCP and relays
the response back to the computer.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server
extensions. It does not mean you can leave the DNS servers out of the DHCP setup
under all circumstances. If your ISP gives you explicit DNS servers, make sure that
you enter their IP addresses in the DHCP Setup menu. This way, the ADSL Router
can pass the DNS servers to the computers and the computers can query the DNS
server directly without the ADSL Router’s intervention.
4.3
DNS Server Address Assignment
Use DNS (Domain Name System) to map a domain name to its corresponding IP
address and vice versa. The DNS server is extremely important because without it,
you must know the IP address of a computer before you can access it.
There are two ways that an ISP disseminates the DNS server addresses:
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 DHCP Setup.
2.
Leave the DNS Server fields in DHCP Setup blank (for example 0.0.0.0).
The ADSL Router acts as a DNS proxy when this field is blank.
4.4
LAN TCP/IP
The ADSL Router has built-in DHCP server capability that assigns IP addresses and
DNS servers to systems that support DHCP client capability.
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37
4.4.1
Factory LAN Defaults
The LAN parameters of the ADSL Router are preset in the factory with the following
values:
1.
IP address of 192.168.1.254 with subnet mask of 255.255.255.0 (24
bits)
2.
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.
4.4.2
IP Address and Subnet Mask
Refer to the
IP Address
and
Subnet Mask
section in the Wizard Setup chapter for
this information.
4.4.3
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.
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4.4.4
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 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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4.5
Configuring LAN
Click
Interface Setup
, then
LAN
to open the following screen:
The following table describes the labels in this screen:
Router Local IP
Field
Description
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.
Dynamic Route
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
Page 40 / 105
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IGMP-v2. Select None to disable it.
IGMP Snoop
Choose Disable or Enable IGMP Snoop function
Save
Click this button to save these settings back to the ADSL Router.
Cancel
Click this button to reset the fields in this screen.
DHCP
Field
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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