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81
Links Bar
Always On:
This setting provides convenience, but it leaves your network permanently
connected to the Internet.
On-Demand:
Furnishes almost all the benefits of an Always On connection, but has
additional security benefits:
Your network cannot be attacked when it is not connected.
Your network may change address with each connection, making it more difficult to
attack.
Manual:
This setting disables automatic connection attempts. The user must bring the
connection up and down via the Connect/Disconnect buttons.
User Inactivity Timeout
: For On-Demand connections only, you can specify the time in
seconds before disconnection if there is no data passing to or from the Internet.
UPnP:
Universal Plug and Play (UPnP™) is a set of protocols that allows a PC to auto-
matically discover other UPnP devices (anything from an internet gateway device to a
light switch), retrieve an XML description of the device and its services, control the
device, and subscribe to real-time event notification. By default, UPnP is enabled on the
Motorola Netopia® Gateway.
For Windows XP users, the automatic discovery feature places an icon representing the
Motorola Netopia® Gateway automatically in the “My Network Places” folder. Double-
clicking this icon opens the Gateway’s web UI.
PCs using UPnP can retrieve the Gateway’s WAN IP address, and automatically create
NAT port maps. This means that applications that support UPnP, and are used with a
UPnP-enabled Motorola Netopia® Gateway, will not need application layer gateway sup-
port on the Motorola Netopia® Gateway to work through NAT.
You can disable UPnP, if you are not using any UPnP devices or applications. Uncheck
the
UPnP Enabled
checkbox.
When all of your entries are made, click the
Sa
ve and Restar
t Connection
button.
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82
Link:
DHCP Ser
ver
When you click
DHCP Ser
ver
, the
DHCP Server Configuration
page appears.
This feature simplifies network administration because the Router maintains a list of IP
address assignments. Additional computers can be added to your LAN without the hassle
of configuring an IP address. This is the default mode for your Router.
The Server configuration determines the functionality of your DHCP Settings. This function-
ality enables the Router to assign your LAN computer(s) a “private” IP address and other
parameters that allow network communication.
Router IP Address:
Specifies the IP address of the Router itself.
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Links Bar
Subnet Mask:
Specifies the subnet mask of the Router itself. Defaults to the common
Class C subnet.
DHCP Start Address:
Specifies the first address in the DHCP address range. You can
reserve a sequence of up to 253 IP addresses (including up to 64 IP addresses for
wireless clients) within a subnet, beginning with the specified address, for dynamic
assignment.
DHCP End Address:
Specifies the last address in the DHCP address range.
DHCP Lease:
Specifies the default length for DHCP leases issued by the Router. Enter
lease time in dd:hh:mm:ss (days/hours/minutes/seconds) format.
DHCP Server Enable:
Uncheck this setting if you already have a DHCP server on your
LAN. This enables the DHCP server in this Router.
Additional IP Subnets
The Additional IP Subnets screen allows you to configure up to seven secondary subnets
and their DHCP ranges, by entering IP address/subnet mask pairs:
Note:
You need not use this screen if you have only a single Ethernet IP subnet.
This screen displays seven rows of editable columns. All seven row labels are always visi-
ble, regardless of the number of subnets configured.
To add an IP subnet, select one of the rows, and click the
Edit
button.
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84
Check the
Enabled
checkbox
and click the
Submit
button.
The screen expands to
allow you to enter subnet
information.
If
DHCP Server
(see
below) is not enabled, the
DHCP Start Address and
DHCP End Address fields
do not appear.
Enter the Router’s IP
address on the subnet in
the
IP Address
field and
the subnet mask for the
subnet in the
Netmask
field.
Enter the
DHCP Start Address
and
End Address
of the subnet range in their respec-
tive fields.
Ranges cannot overlap and there may be only one range per subnet.
Click the
Submit
button.
When you are finished adding subnets, click the
Sa
ve Chang
es
button, and when
prompted, restart the Router.
To delete a configured subnet, set both the IP address and subnet mask values to 0.0.0.0,
either explicitly or by clearing each field and clicking the
Submit
button to commit the
change.
NOTE:
All additional DHCP ranges use the global lease period value. See
page 82
.
If you make any changes, click the
Sa
ve Chang
es
button.
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Links Bar
Link:
IP P
assthr
ough
When you click
IP P
assthr
ough
, the
IP Passthrough Configuration
page appears.
The IP passthrough feature allows a single PC on the LAN to have the Router’s public
address assigned to it. It also provides PAT (NAPT) via the same public IP address for all
other hosts on the private LAN subnet. Using IP passthrough:
The public WAN IP is used to provide IP address translation for private LAN computers.
The public WAN IP is assigned and reused on a LAN computer.
DHCP address serving can automatically serve the WAN IP address to a LAN computer.
When DHCP is used for addressing the designated passthrough PC, the acquired or
configured WAN address is passed to DHCP, which will dynamically configure a single-
servable-address subnet, and reserve the address for the configured PC’s MAC
address. This dynamic subnet configuration is based on the local and remote WAN

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