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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.

82

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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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

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