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Page 31 / 74 Scroll up to view Page 26 - 30
ATU-R130 ADSL Ethernet Router User’s Guide
23
6
Configuring Dynamic Host Configuration
Protocol
You can configure your network and ATU-R130 to use the Dynamic Host Configuration
Protocol (DHCP). This chapter provides DHCP instructions for implementing it on your
network.
{
XE "DHCP:device modes"
}
The device can be configured as a DHCP server, DHCP
relay agent, or, in some cases, a DHCP client.
Note
You can input settings for both DHCP server and DHCP relay
mode, and then activate either mode at any time. De-activated
settings are retained for your future use.
Configuring DHCP Server
Note
By default, the device is configured as a DHCP server, with a
predefined IP address pool of 192.168.1.2 through 192.168.1.13
(subnet mask 255.255.255.0). To change this range of
addresses, see “
Viewing, modifying, and deleting address
pools
”
on page 25.
First, you must configure your PCs to accept DHCP information assigned by a DHCP
server:
1.
Open the Windows Control Panel and display the computer's Networking
properties. Configure the TCP/IP properties to "Obtain an IP address
automatically" (the actual text may vary depending on your operating system).
{
XE "DHCP server:configuring the device as"
}
Next, you define the pools of IP
addresses you want to make available for distribution to your computers. These
addresses can be multiple public addresses that you have purchased from your ISP,
but are typically private addresses that you create. (LAN administrators often create
private IP addresses for use only on their networks.
2.
Log into Configuration Manager, click the LAN tab, and then click
DHCP Server
in
the task bar.
The DHCP Server Configuration page displays, as shown in Figure 15.
Figure 14. DHCP Configuration Page
Each pool you create displays in a row on the table on this page.
You can create up to eight pools; however, most users will need to create only one for their
LAN. Some users many want to create another that distributes an IP address to their USB
Page 32 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
24
computer, which must be in a different subnet than the LAN computers.
{
XE "DHCP
Configuration page"
}{
XE "Pages:DHCP Configuration"
}
3.
To add an IP address pool, click
.
The DHCP Server Pool – Add page displays, as shown in Figure 16.
Figure 15. DHCP Server Pool – Add Page{ XE "DHCP
Server Pool—
Add page" }{ XE "Pages:DHCP Server Pool -
Add" }
4.
Enter the
Start IP Address
,
End IP Address
,
Net Mask
, and
Gateway Address
fields are required; the others are optional. The following table describes each
field.
Field
Description
Start/End IP
Addresses
Specify the lowest and highest addresses
in the pool.
Mac Address
{
XE "
MAC
addresses:
in
DHCP pools"
}
Use this field only if you want to assign a
specific IP address to a specific computer
(that is, you are creating an exception to
the dynamic assignment of addresses).
The IP address you specify will be
assigned to the computer that
corresponds to this MAC address. (A MAC
address is a manufacturer-assigned
hardware ID that is unique for each device
on a network.) If you type a MAC address
here, you must have specified the same IP
address in both the Start IP Address and
End IP Address fields.
Page 33 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
25
Field
Description
Net Mask
Specifies which portion of each IP address
in this range refers to the network and
which portion refers to the host
(computer). You can use the network
mask to distinguish which pool of
addresses should be distributed to a
particular subset of computers on your
LAN (called a
subnet
).
Domain Name
{
XE "
Domain
name
"
}
A user-friendly name that refers to the
group of computers (subnet) that will be
assigned addresses from this pool.
Gateway
Address
{
XE
"
Gatewas:
in
DHCP pools"
}
The address of the default gateway for
computers that receive IP addresses from
this pool. The default gateway is the IP
address that the computers first contact to
communicate with the Internet. Typically, it
is the device’s LAN port IP address.
DNS/SDNS
Address
{
XE
"
DNS
"
}
The IP address of the
Domain Name
System
server and
Secondary Domain
Name System
server to be used by
computers that receive IP addresses from
this pool. These DNS servers translate
common Internet names that you type into
your web browser into their equivalent
numeric IP addresses. Typically, these
servers are located with your ISP.
SMTP...SWINS
(optional)
The IP addresses of devices that perform
various services for computers that
receive IP addresses from this pool (such
as the SMTP, or
Simple Mail Transfer
Protocol
, server which handles e-mail
traffic). Contact your ISP for these
addresses.
5.
Click
.
A confirmation page displays briefly to indicate that the pool has been added
successfully. After a few seconds, the DHCP Server Pool – Add page displays with the
newly added pool.
6.
Follow the instructions in “Setting the DHCP Mode”on page 28 to set the DHCP
mode to DHCP Server.
Viewing, modifying, and deleting address pools, and excluding IP addresses from a
pool{
XE "DHCP server:modifying, viewing pools"
}
To view, modify, or delete an existing address pool, display the DHCP Server Configuration
page, and click the icons in the corresponding row in the address pool table.
?
To delete an IP address pool, click
, then submit and commit your changes.
?
To view details on an IP address pool, click
. A page displays with all the same
information you entered when adding the pool.
To modify the domain name associated with an IP address pool, or to exclude
addresses from the pool, click
. The DHCP Server Pool – Modify page displays,
as shown in Figure .
Page 34 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
26
Figure 16.
DHCP Server Pool – Modify Page
Excluded addresses are those that you have designated for fixed use with specific devices,
or for some other reason do not want to make available to your network.
{
XE "IP address pools:modifying"
}
To exclude an address from distribution
{
XE "IP
address pools:excluding addresses"
}
, type it in the fields provided and click
. Click
after entering your changes. Be sure to use the Commit feature to save your
changes to permanent memory, as described on page 17.
Viewing current DHCP address assignments
{
XE "DHCP server:viewing assigned addresses"
}
When the ATU-R130 functions as a
DHCP server for your LAN, it keeps a record of any addresses it has leased to your
computers. To view a table of all current IP address assignments,
display the DHCP Server
Configuration page, click
.
A page displays similar to that shown in Figure :
Figure 17. DHCP Server Address Table Page{ XE "DHCP Address Table page" }{ XE
"Pages:DHCP Address Table" }
The DHCP Server Address Table lists any IP addresses that are currently leased to LAN
devices. For each leased address, the table lists the following information:
Field
Description
IP Address
The address that has been leased from the pool.
Netmask
{
XE
"Network
mask:in DHCP
address table"
}
The network mask associated with the leased address,
which identifies the network ID and host ID portions of
the address (see Appendix A).
Page 35 / 74
ATU-R130 ADSL Ethernet Router User’s Guide
27
Field
Description
Mac Address
{
XE "MAC
addresses:in
DHCP Address
Table"
}
A hardware ID for the device to which the number
has been assigned.
Pool Start
The lower boundary of the address pool
(provided to identify the pool from which the
leased number came).
Address Type
Static or Dynamic.
Static
indicates that the IP
number has been assigned permanently to the
specific hardware device.
Dynamic
indicates that
the number has been leased temporarily for a
specified length of time.
Time
Remaining
The amount of time left for the device to use the
assigned address.
Configuring DHCP Relay
{
XE "DHCP relay:Configuring the device as"
}
Some ISPs perform the DHCP server
function for their customers’
home/small office networks. In this case, you can configure the
device as a DHCP relay agent. When a computer on your network requests Internet
access, the ATU-R130 contacts your ISP to obtain an IP address (and other information),
and then forwards that information to the computer.
First, you must configure your PCs to accept DHCP information assigned by a DHCP
server:
1.
Open the Windows Control Panel and display the computer's Networking
properties. Configure the TCP/IP properties to "Obtain an IP address
automatically" (the actual text may vary depending on your operating system).
Next, you specify the IP address of the DHCP server and select the interfaces on
your network that will be using the relay service.
2.
Log into the Configuration Manager, click the LAN tab, and then click
DHCP Relay
in the task bar.
The DHCP Relay Configuration page
{
XE "DHCP Relay Configuration page"
}{
XE
"Pages:DHCP Relay Configuration"
}
displays, as shown in Figure 19.
Figure 18. DHCP Relay Configuration Page{ XE "DHCP Relay Configuration page" }{ XE
"Pages:DHCP Relay Configuration" }
3.
Type the IP address of your ISP’s DHCP server in the fields provided.
If you do not have this number, it is not essential to enter it here. Requests for IP
information from your LAN will be passed to the default gateway, which should route
the request appropriately.

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