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NB4 User Guide
YML733Rev1
36
www.netcomm.com.au
Static Routing
If the Router is required to serve more than one network, you will need to set up a Static Route
between the networks. Static routing can be used to allow users from one IP domain to access
the Internet through the Router in another domain.
A Static Route provides the defined
pathway that network information must travel to reach the specific host or network which is
providing Internet access .
To access the Static Routing controls, click on Advanced>Advanced Features> Static Routing.
Configuring Static Routing:
Choose a Connection: presents list of Saved Connections.
Select appropriate connection from
list.
The New Destination IP is the address of the remote LAN network or host to which you want
to assign a static route. Enter the IP address of the host for which you wish to create a static
route here. For a standard Class C IP domain, the network address is the first three fields of the
New Destination IP, while the last field should be 0. The Subnet Mask identifies which portion
of an IP address is the network portion, and which portion is the host portion. For a full Class
C Subnet, the Subnet Mask is 255.255.255.0. The Gateway IP address should be the IP address
of the gateway device that allows for contact between the Gateway and the remote network or
host.
Gateway: IP address refers to the IP address of the near device that is to connect with the
remote network or host. If the NB4 is fulfilling this function then its IP address will be entered
in this field.
To save changes, click on Apply, then click on Save Settings.
Page 37 / 77
YML733 Rev1
NB4 User Guide
www.netcomm.com.au
37
Dynamic Routing
Dynamic Routing makes use of the RIP Protocol to allow the ADSL Router to automatically
adjust to physical changes in the network. The NB4, using the RIP protocol, will determine the
network packet route based on the fewest number of hops between the Source and the
Destination. The RIP protocol regularly broadcasts routing information to other Routers on the
network and is part of the IP Suite.
To access Dynamic Routing click Advanced>Advanced Features>Dynamic Routing.
Enable RIP:
if this box is checked, Dynamic Routing is enabled.
Protocol:
choice is dependent upon the network environment. Most networks
support Rip v1. If RIP v1 is selected, routing data will be sent in RIP v1
format. If Rip V2 is selected, routing data will be sent in RIP v2 format
using Subnet Broadcasting. If Rip V1 Compatible is selected, routing
data will be sent in RIP v2 format using Multicasting.
Direction:
determines the direction that RIP routes will be updated.
Select 'In':
the Router will only incorporate received RIP information.
Select 'Out':
the ADSL Router will only send out RIP information.
Select 'Both':
the ADSL Router will both incorporate received RIP information and
send out updated RIP information.
Page 38 / 77
NB4 User Guide
YML733Rev1
38
www.netcomm.com.au
Port Forwarding
Port Forwarding is necessary because NAT [=Network Address Translation] only forwards
traffic from the Internet to the LAN if a specific port mapping exists in the NAT translation
table. Because of this, the NAT provides a level of protection for computers that are connected
to your LAN. However, this also creates a connectivity problem when you want to make LAN
resources available to Internet clients, which you may want to do to play network games or
host network applications.
Thus Port Forwarding is necessary to run certain games, chat clients, video-conferencing and
other kinds of application.
You might also need to configure port-forwarding if you intend to
host a web server or mail server that is to be visible outside your LAN.
TIP:
In situations where you are hosting a Web Site or, for example, setting up a
regular NetMeeting link, it is advisable to consider implementing a Fixed IP
address, otherwise the dynamic IP address allocated by DHCP will need to be
communicated prior to every user session.
To access Port Forwarding, click on Advanced>Firewall>Port Forwarding
Page 39 / 77
YML733 Rev1
NB4 User Guide
www.netcomm.com.au
39
Easy Port Forwarding: Applying Pre-Defined Rules
WAN Connection: refers to the active Connection Profile.
LAN IP: refers to the local Router IP address; the NB4 Default IP is shown in this example.
New IP: If you wish to manually add a LAN client so that you can apply rules to it, click on
the New IP Button and enter Host Name and IP Address.
Available pre-defined rules are categorised according to the application type.
Click the Radio
Button adjacent to the appropriate Category, and then select the required application name.
Click on the Add button to move the application into the Applied Rules box. In the example
shown on the previous page, 'Delta Force' has been selected from the list of Available Rules
and is about to be copied to Applied Rules.
In the example, this will configure the NB4 ports
to use with 'Delta Force' .
To remove a rule from the Applied Rules box, select the Rule and click on the Remove Button.
To save changes, click on Apply, then click on Save Settings.
Advanced Port Forwarding: Creating Custom Rules
If there is no pre-defined Port Forwarding Rule for a particular application, a User Rule can be
created which defines the required Port(s), Protocol(s) and Internal Port forwarding rules.
Note than in this section, 'inside port' is indicated by the port map field and corresponds to the
port number on the LAN Client. 'Outside ports' refer to the WAN port numbers and are
designated by the 'port start' and 'port end' fields.
To create a custom rule you will need to know the specific port number(s) and port type [UDP
or TCP] that the application requires. These will be the outside port numbers. Some applica-
tions specify a range of ports in which case you will need to know both the starting and ending
port numbers in the range, which are mapped by the start port and end port fields.
The Port Map field specifies the internal port that the data will be directed to on the LAN
Client. When dealing with port ranges, the Internal Port (designated by the Port Map field) will
be the same as the first port in the range. When you simply want to forward a single port from
outside (i.e. WAN side) to inside (i.e. LAN side), then all three fields (Port Start, Port End and
Port Map) will have the same port number.
Page 40 / 77
NB4 User Guide
YML733Rev1
40
www.netcomm.com.au
To create a New Port Forward Rule:
On the Port Forwarding page shown in the figure above, click on the User radio button, then
on the New Button.
Rule Name: enter a name that identifies the rule; for the sake of clarity this will usually be the
name of the application.
The name must be unique, must not contain spaces and cannot begin
with a number.
Protocol: can be either TCP or UDP, or both.
Port start…port end: These will be the same if you are forwarding only a single port.
If there is
a range, then port start is the first number in the range, and port end will be the last number.
Port Map: this is the port number that the data should be forwarded to on the specified LAN IP
(i.e. the inside port).
This is usually the same as the port start figure.
TIP: It is possible to map outside port numbers, or ranges [i.e. port start…port end] to a
different inside port numbers [port map] for reasons of security or convenience.
Click 'Apply'
The Port Rule settings defined by this process will then be displayed in a table at the bottom of
the Rule Management panel.
If you wish to add more ports to this rule, leave the text name in the Rule Name field and enter
the new port settings. Click 'Apply' and the new settings will be added to the list.
Adding Custom Rules to Applied Rules List
When you have assigned all necessary ports to the Rule and they appear in the table, click on
the Port Forwarding menu item to return to the main Port Forwarding screen.
User-created rules will be shown in the Available Rules list when the User Category radio
button is selected. You can now apply the rule(s) by selecting it and clicking Add. This will add
the rule to list of applied rules.
Click on Save Settings on the left-hand menu to make changes permanent.

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