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Page 51 / 112 Scroll up to view Page 46 - 50
YML754 Rev1
NB5Plus4/W User Guide
www.netcomm.com.au
51
getting direct access to LAN computers while still being able to access services
hosted on the designated DMZ Computer.
When using NAPT to share your internet connection, LAN computers will still be able
to access the Internet when the DMZ host is enabled. Any direct communication
to the WAN port of your Modem that is not a reply to the original NAPT request is
forwarded to the DMZ host.
Option
Description
Select your WAN
Co°°ectio°:
Select the connection to which your
DMZ client is connected to.
Select LAN ±roup:
Select the LAN group in which you want
to place the DMZ client.
Select a LAN IP
Address:
Select the LAN IP address of the DMZ
client.
LAN Clie°ts:
Click the LAN clients hyperlink to manu-
ally add a LAN client.
Click the Apply button to save the settings.To remove a rule from the Applied Rules
box, select the Rule and click on the Remove Button.
To save changes, click on Apply.
Advanced Port Forwarding: Creating Custom Rules
Click the Custom Port Forwarding link to setup a custom rule.
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.
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 num
-
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bers. Some applications 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 Destination 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 (des-
ignated 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.
Option
Description
Co°°ectio°:
Choose the connection to which the rule
is to be applied to.
Applicatio°:
Provide a name for the application (e.g.
Azureus).
The name must be unique,
must not contain spaces and cannot
begin with a number.
Protocol:
Can be either TCP or UDP, or both.
Option
Description
Source IP Address:
The client on the Internet sending the
data (e.g. 202.44.55.66). Note, if you
do not know the IP address of the client
use 0.0.0.0 for any client on the Inter-
net.
Source Netmask:
The subnet mask
of the client connect-
ing to you. Note, if you do not know the
Netmask use 0.0.0.0.
Desti°atio° IP Address:
The LAN IP address of the device on
your network to which packets of data
will be forwarded to (e.g. 192.168.1.2).
Desti°atio° Netmask:
The subnet mask of the LAN device.
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YML754 Rev1
NB5Plus4/W User Guide
www.netcomm.com.au
5²
Destination Port Start
& Desti°atio° Port E°d.
The ports on the remote client from
which data is being sent to your mo-
dem’s corresponding ports. 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.
Desti°atio° Port Map:
This is the port number that the data
should be forwarded to on the speci-
fied 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
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NB5Plus4/W User Guide
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54
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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.
Advanced > IP Filters
The IP filters page allows you to specify Normal Port Forwards,
Block ALL traffic
to specific LAN Clients or specify Custom IP filters that will control the flow of data
across the router.
Custom IP Filters (often also referred to as ‘Access Control Lists’ ) allow you to
specify individual rules that will deny traffic by defining the following:
•
Source IP address or IP Subnet
•
Destination IP address or Subnet
•
Port or Port range
•
Protocol
Custom IP filters are different from Port forwards, or Block All traffic because they
allow greater scopes of IP addresses to be included in the block.
Note:
You must have at least one LAN Client in your LAN clients table before IP
filters can be created. To create a LAN Client, see the section below on LAN
Clients under the Advanced Menu.
Advanced > Access Control
Use Access Control to configure advanced security functions by customising the
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YML754 Rev1
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55
Modem Firewall.
The default ‘Firewall On’ setting blocks all anonymous Internet
traffic.
Access control enables the user to selectively direct such traffic, for example
to a Web Host in the DMZ or to specific ports opened for such applications as Web,
Telnet or FTP.
CAUTION: This dialog box indicates that you should not disable LAN Web Access
or else you might not be able to connect to the device. If you become
locked out of the device
perform a Restore Factory Default as detailed
earlier in this manual.
To configure Access Control, click on Advanced>Access Control.
This will reveal the
Enable Access Control screen.
The default configuration enables Telnet, Web, FTP
and SSH access FROM the LAN TO the WAN.
Access FROM the WAN to the LAN is
not available in the default configuration.
Enable Access Control: check this box to enable selective access from the WAN to
your LAN for applications of the class indicated by the relevant check boxes. If Ac-
cess Control is not enabled, the individual check boxes cannot be checked.
If Access Control is enabled, and an Enable WAN checkbox is selected, then WAN
access to the matching service is enabled.
In other words, for example, if your
were to enable Telnet access on the WAN you could then manage and configure
your modem from anywhere on the Internet via Telnet.
Caution:
Enabling WAN access to your modem reduces security.
IP Access List: This enables you to specify which LAN/WAN IP addresses are allowed
access to the modem configuration services specified.
Tools
The Tools section allows you to save the configuration, restart the gateway, update
the gateway firmware, setup user and remote log information and run Ping and
Modem tests.
Tools>System Commands
System commands allow you to carry out basic system actions. Press the button to
execute a command.
Here you will find the following functions:
•
Save All
•
Restart
•
Restore Defaults (same as pressing and holding the button on the back to clear
and reset to factory default.
Note:
If you Restore Defaults you will need to reconfigure your internet connec
-
tion settings, ISP Username & Password etc.
Tools>User Management
User Management is used to change your NB5Plus4/W’s User Name or Password.
Option
Description
User Name:
Default is ‘admin’.
Password:
Default is ‘admin’.

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