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Page 16 / 30 Scroll up to view Page 11 - 15
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Manually Configuring your Modem
Manually Configuring your Modem
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Parameter
Description
IP Address
The IP address of the Modem.
IP Subnet Mask
The subnet mask of the Modem.
DHCP Server
To dynamically assign an IP address to client PCs,
enable the DHCP (Dynamic Host Configuration
Protocol) Server.
Lease Time
Set the DHCP Lease Time
DHCP Option
60 Vendor ID
If you wish you can Specify the Name of your
DHCP Server (Optional)
Lease Time
Specify the length of time that the DHCP will
assign an IP address to a computer for.
Start IP
Specify the start IP address of the DHCP pool.
Do not include the gateway address of the
Modem in the client address pool. (See “TCP/IP
Configuration”). If you attempt to include the
Modem gateway address (10.1.1.1 by default) in
the DHCP pool, an error dialog box will appear.
If you change the pool range, make sure the first
three octets match the gateway’s IP address, i.e.,
10.1.1.xxx.
End IP
Specify the end IP address of the DHCP pool.
Domain Name
If your network uses a domain name, enter it here.
Otherwise, leave this field blank.
DHCP Client List
The DHCP Clients List
displays the IP Address,
Host Name and MAC
Address of each client
that has requested an IP
address since the last
reboot of the Modem.
Check the FIX box to have
the IP address and the
MAC address linked so
that the IP address will
always be assigned as it is
on this screen.
NAT
From this section you can configure the Virtual Server, and Special
Application features that provide control over the TCP/ UDP port
openings in the Modem’s firewall. This section can be used to support
several Internet based applications such as web, email, FTP, and
Telnet.
NAT Settings
NAT allows one or more
public IP addresses to be
shared by multiple internal
users.
You can enable
or disable NAT here.
Recommended setting =
Enable.
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Address Mapping
Use Address Mapping to
allow a limited number of
public IP addresses to be
translated into multiple
private IP addresses for
use on the internal LAN
network. This also hides
the internal network for
increased privacy and
security.
Port Forwarding
If you configure the Port
Forwarding settings,
remote users accessing
services such as web
or FTP at your local site
via public IP addresses
can be automatically
redirected to local servers
configured with private
IP addresses. In other
words, depending on
the requested service
(TCP/UDP port number),
the Modem redirects the
external service request to the appropriate server (located at another
internal IP address).
For example, if you set Type/Public Port to TCP/80 (HTTP or web)
and the LAN IP Address/LAN Port to 10.1.1.3/80, then all HTTP
requests from outside users will be transferred to 10.1.1.3 on port 80.
Therefore, by just entering the IP address provided by the ISP, Internet
users can access the service they need at the local address to which
you redirect them.
The more common TCP service ports include:
HTTP: 80, FTP: 21, Telnet: 23, and POP3: 110.
Special Applications
Some applications, such
as Internet gaming,
video conferencing,
Internet telephony and
others, require multiple
connections. These
applications cannot work
with Network Address
Translation (NAT) enabled.
If you need to run
applications that require
multiple connections,
use the following screen
to specify the additional
public ports to be opened for each application.
Specify the public port number normally associated with an
application in the Trigger Port field. Set the protocol type to TCP
or UDP, and then enter the ports that the application requires. The
ports may be in the format 7, 11, 57, or in a range, e.g., 72-96, or a
combination of both, e.g., 7, 11, 57, 72-96.
Popular applications
requiring multiple ports
are listed in the Popular
Applications field. From
the drop-down list, choose
the application and then
choose a row number to
copy this data into.
Note: Choosing a row
that already contains data
will overwrite the current
settings.
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NAT Mapping Table
NAT Mapping Table
displays the current
NAPT (Network Address
Port Translation) address
mappings. The NAT
address mappings are
listed 20 lines per page,
click the control buttons
to move forwards and
backwards. As the NAT
mapping is dynamic, a
Refresh button is provided
to refresh the NAT
Mapping Table with the
most up-to-date values.
The content of the NAT Mapping Table is described as follows:
•
Protocol - protocol of the flow.
•
Local IP - local (LAN) host’s IP address for the flow.
•
Local Port - local (LAN) host’s port number for the flow.
•
Pseudo IP - translated IP address for the flow.
•
Pseudo Port - translated port number for the flow.
•
Peer IP - remote (WAN) host’s IP address for the flow.
•
Peer Port - remote (WAN) host’s port number for the flow.
Route
These pages define routing related parameters, including static routes
and Routing Information Protocol (RIP) parameters.
Static Route Parameters
Static routing is the manual method used to set up routing. A network
administrator enters routes into the Modem using the following
screens. This method has the advantage of being predictable, and
simple to set up. It is easy to manage in small networks but does not
scale well.
Parameter
Description
Index
Displays the number of the route.
Network
Address
Displays the IP address of the remote computer
for which to set a static route.
Subnet Mask
Displays the subnet mask of the remote network
for which to set a static route.
Gateway
Displays the WAN IP address of the gateway to
the remote network.
Configure
Allows you to modify or delete configuration
settings
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Click Add or Edit to display the following page and add a new static
route to the list.
Parameter
Description
Index
Displays the number of the route.
Network
Address
Enter the IP address of the remote computer for
which to set a static route.
Subnet Mask
Enter the subnet mask of the remote network for
which to set a static route.
Gateway
Enter the WAN IP address of the gateway to the
remote network.
RIP Parameter
The device supports Routing Information Protocol (RIP) v1 and v2 to
dynamically exchange routing information with adjacent Modems.
Parameter
Description
RIP mode
Globally enables or disables RIP.
Auto summary
If Auto summary is disabled, then RIP packets will
include sub-network information from all sub¬net
works connected to the ADSL Modem. If enabled,
this sub-network information will be summarized
to one piece of information covering all sub-
networks.
Interface
The WAN interface to be configured.
Operation
Mode
Disable: RIP disabled on this interface.
Enable: RIP enabled on this interface.
Silent: Listens for route broadcasts and updates
its route table. It does not participate in sending
route broadcasts.
Version
Sets the RIP version to use on this interface.
Poison Reverse
A method for preventing loops that would cause
endless retransmission of data traffic.
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Authentication
Required
None: No authentication.
Password: A password authentication key is
included in the packet. If this does not match
what is expected, the packet will be discarded.
This method provides very little security as it
is possible to learn the authentication key by
watching RIP packets.
MD5: An algorithm that is used to verify data
integrity through the creation of a 128-bitmessage
digest from data input (which may be a message
of any length) that is claimed to be as unique to
that specific data as a fingerprint is to a specific
individual.
Authentication
Code
Password or MD5 Authentication key.
RIP sends routing-update messages at regular intervals and when
the network topology changes. When a Modem receives a routing
update that includes changes to an entry, it updates its routing table
to reflect the new route. RIP Modems maintain only the best route to
a destination. After updating its routing table, the Modem immediately
begins transmitting routing updates to inform other network Modems
of the change.
Routing Table
Parameter
Description
Flags
Indicates the route status:
C = Direct connection on the same subnet.
S = Static Modem
R = RIP (Routing Information Protocol) assigned
route.
I = ICMP (Internet Control Message Protocol)
Redirect route.
Network
Address
Destination IP address
Netmask
The subnetwork associated with the destination.
This is a template that identifies the address bits
in the destination address used for routing to
specific subnets. Each bit that corresponds to a
“1” is part of the subnet mask number; each bit
that corresponds to “0” is part of the host number.
Gateway
The IP address of the Modem at the next hop to
which frames are forwarded.
Interface
The local interface through which the next hop of
this route is reached.
Metric
When a Modem receives a routing update that
contains a new or changed destination network
entry, the Modem adds 1 to the metric value
indicated in the update and enters the network in
the routing table.

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