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DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
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5.
Select Private if you want to limit access to the LAN only. The private static route will not be
advertised in RIP.
6.
Enter the Destination IP Address to the host or network to which the route leads.
7.
Enter the IP Subnet Mask for this destination. If the destination is a single host, enter
255.255.255.255.
8.
Enter the Interface which is the physical network interface (WAN1, WAN2, or LAN) through
which this route is accessible.
9.
Enter the Gateway IP Address through which the destination host or network can be reached
(must be a firewall on the same LAN segment as the firewall).
10.
Enter the Metric priority for this route. If multiple routes to the same destination exit, the route
with the lowest metric is chosen. (value must be between 1 and 15),
11.
Click
Apply
to save your settings. The new static route will be added to Route table.
12.
Click
Reset
to discard any changes and revert to the previous settings.
You can edit the route’s settings by clicking
Edit
in the Action column adjacent to the route.
Routing Information Protocol (RIP)
RIP (Routing Information Protocol, RFC 2453) is an Interior Gateway Protocol (IGP) that is
commonly used in internal networks (LANs). It allows a router to exchange its routing information
automatically with other routers, and allows it to dynamically adjust its routing tables and adapt to
changes in the network. RIP is disabled by default.
To configure RIP parameters:
1.
Select
Network Configuration
from the main menu and
Routing
from the submenu. When
the
Routing
screen displays, click
RIP Configuration.
The
RIP Configuration
screen will
display.
2.
From the
RIP Direction
pull-down menu, select the direction in which the router will send
and receives RIP packets. The choices are:
None
– The router neither broadcasts its route table nor does it accept any RIP packets
from other routers. This effectively disables RIP.
Both
– The router broadcasts its routing table and also processes RIP information received
from other routers.
Out Only
– The router broadcasts its routing table periodically but does not accept RIP
information from other routers.
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In Only
– The router accepts RIP information from other routers, but does not broadcast
its routing table.
3.
From the
RIP Version
pull-down menu, select the version:
RIP-1
– A classful routing that does not include subnet information. This is the most
commonly supported version.
RIP-2 –
Supports subnet information. Both RIP-2B and RIP-2M send the routing data in
RIP-2 format:
RIP-2B
Sends the routing data in RIP-2 format and uses subnet broadcasting.
RIP-2M
Sends the routing data in RIP-2 format and uses multicasting.
4.
Authentication for RIP2B/2M required?
If you selected RIP-2B or RIP-2M, check the
YES
radio box to enable the feature, and input the
First Key Parameters
and
Second Key
Parameters
MD-5 keys to authenticate between routers.
Figure 7-5
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DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
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5.
Click
Reset
to discard any changes and revert to the previous settings.
6.
Click
Save
to save your settings.
Static Route Example
For example, you may require a static route if:
Your primary Internet access is through a cable modem to an ISP.
You have an ISDN firewall on your home network for connecting to the company where you
are employed. This firewall’s address on your LAN is 192.168.1.100.
Your company’s network is 134.177.0.0.
When you first configured your firewall, two implicit static routes were created. A default route
was created with your ISP as the gateway, and a second static route was created to your local
network for all 192.168.1.x addresses. With this configuration, if you attempt to access a device on
the 134.177.0.0 network, your firewall will forward your request to the ISP. The ISP forwards your
request to the company where you are employed, and the request will likely be denied by the
company’s firewall.
In this case you must define a static route, telling your firewall that 134.177.0.0 should be accessed
through the ISDN firewall at 192.168.1.100.
In this example:
The Destination IP Address and IP Subnet Mask fields specify that this static route applies to
all 134.177.x.x addresses.
The Gateway IP Address fields specifies that all traffic for these addresses should be
forwarded to the ISDN firewall at 192.168.1.100.
A Metric value of 1 will work since the ISDN firewall is on the LAN.
Private is selected only as a precautionary security measure in case RIP is activated.
Enabling Universal Plug and Play (UPnP)
Universal Plug and Play (UPnP) can improve the overall networking experience through automatic
discovery and device interoperability. UPnP helps devices, such as Internet appliances and
computers, access the network and connect to other devices as needed. UPnP devices can
automatically discover the services from other registered UPnP devices on the network.
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By default, UPnP is disabled. When disabled, the router will not allow any device to automatically
control the resources of the router; for example, port forwarding. When enabled, you must set the
Advertisement Period and the Advertisement Time to Live according to the following criteria:
Advertisement Period
. Determines how often the router will advertise (broadcast) its UPnP
information. This value can range from 1 to 1440 minutes. The default period is 30 minutes.
Shorter durations will ensure that control points have current device status, but this can create
additional network traffic. Longer durations may compromise the freshness of the device
status but can significantly reduce network traffic.
Advertisement Time To Live
. The time to live for the advertisement is measured in hops
(steps) for each UPnP packet sent. A hop is the number of steps allowed to propagate for each
UPnP advertisement before it disappears. The number of hops can range from 1 to 255. The
default value for the advertisement time to live is 4 hops, which should be fine for most home
networks. If you notice that some devices are not being updated or reached correctly, then it
may be necessary to increase this value a little.
The UPnP Portmap Table shows IP addresses and other settings of UPnP devices that have
accessed this wireless gateway. These settings are described in the following Portmap table.
Table 7-1.
UPnP Portmap Table settings
Settings
Description
Active
Yes or No indicates whether or not the port of the UPnP device that
established a connection is currently active.
Protocol
The network protocol (for example, HTTP, FTP, etc.) that the device is using
to connect to this wireless gateway.
Int. Port (Internal Port)
Which, if any, internal ports are opened by the UPnP device.
Ext. Port (External Port)
Which, if any, external ports are opened by the UPnP device.
IP Address
The IP address of the UPnP device that is accessing this gateway.
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To turn on and set up UPnP:
1.
Select
Security
from the main menu and
UPnP
from the submenu. The
UPnP
screen will
display.
2.
Enable the UPnP radio by selecting the
Yes
radio box.
3.
Modify the default
Advertisement Period
and
Advertisement Time to Live
settings, if
desired. The defaults are 30 minutes and 4 hops, respectively.
4.
Click
Apply
to save the new settings. Devices attached to the router can now use the router
resources.
5.
Click
Refresh
to update the Portmap table to show active ports currently opened by UPnP
devices.
Figure 7-6

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