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NETCOMM GATEWAY™ SERIES –
NB304N – ADSL2+ Wireless N300 Modem Router
26
NetComm NB304N – ADSL2+ Wireless N300 Modem
YML304X
www.netcomm.com.au
NAT
NAT stands for Network Address Translation, a process which converts private IP addresses of a computer on the internal private
network to one or more public IP addresses for the Internet. NAT changes the packet headers to the new address and keeps track
of each session; when packets come back from the Internet, it performs the reverse conversion to the IP address of the client
machine.
Virtual Servers
Virtual Server allows you to direct incoming traffic from the Internet to a specific computer in your local network. A maximum 32
entries can be configured.
Click Add to create a Virtual Server.
As an example, to setup a web server on a computer using 192.168.1.88 as its IP Address, select HTTP as Service and enter
192.168.1.88 as the Server IP Address. Otherwise if the service you want to setup is not available from the Select a Service drop-
down list, you can define your own Virtual Server.
1.
Enter the IP Address to forward the incoming connections to.
2.
Enter the External Port range for the incoming connections
3.
Select the appropriate protocol
4.
Enter the Internal Port Range
Click Save/Apply to save the new Virtual Server configuration settings.
Page 27 / 56
www.netcomm.com.au
27
NetComm NB304N – ADSL2+ Wireless N300 Modem
YML304X
Port Triggering
Some applications require that the specific ports in the router’s firewall be opened for access by the remote parties. For instance, an
application uses port 25 for requests and port 113 for replies. If a computer on the LAN connects to port 25 on a remote server
hosting this application, using Port Triggering on the router, incoming connections to port 113 (from the remote server) could be
redirected to the PC which initiated the request. A maximum of 32 entries can be configured.
Click Add to setup Port Triggering.
1.
Enter the External Port range for the incoming connections
2.
Select the appropriate protocol
3.
Enter the Internal Port Range
Click Save/Apply to save the new Port Trigger configuration settings.
DMZ Host
If a computer is assigned as a DMZ Host, it will receive all the data from the Internet that does not belong to the list of applications
configured as a Virtual Server. Enter the LAN IP address of the PC you wish to set as DMZ Host in the DMZ Host IP Address. If you
need to disable the DMZ Host, just clear the DMZ Host IP Address field, and then click Save/Apply.
Please note: The DMZ exposes your computer to the Internet. Ensure appropriate steps are taken to protect it.
Page 28 / 56
NETCOMM GATEWAY™ SERIES –
NB304N – ADSL2+ Wireless N300 Modem Router
28
NetComm NB304N – ADSL2+ Wireless N300 Modem
YML304X
www.netcomm.com.au
ALG
An Application Layer Gateway (ALG) allows two or more simultaneous NAT connections to be made by clients through this router.
Select the specific ALG NAT functions to enable and click Save/Apply.
Multi NAT
Multi NAT enables the NB304N to support a number of different NAT types such as:
One to One
One to Many
Many to One
Many to Many
1.
Select the type of NAT to use from the Rule Type dropdown menu.
2.
Select the interface to apply the NAT rule to
3.
Enter the appropriate Internal Address Start and Internal Address End
4.
Enter the appropriate External Address Start and External Address End
5.
Click Save/Apply to save the new Multi NAT configuration settings.
Page 29 / 56
www.netcomm.com.au
29
NetComm NB304N – ADSL2+ Wireless N300 Modem
YML304X
Security
IP Filtering
The router supports IP Filtering which allows you to easily set up rules to control incoming and outgoing Internet traffic. The router
provides two types of IP filtering: Outgoing IP Filtering and Incoming IP Filtering.
Outgoing IP Filtering
By default, the router allows all outgoing Internet traffic from the LAN but by setting up Outgoing IP Filtering rules, you can block
some users and/or applications from accessing the Internet.
To delete the rule, click Remove checkbox next to the selected rule and click Remove.
To create a new outgoing IP filter, click Add. The Add IP Filter-Outgoing page will be displayed.
Enter the following parameters:
PARAMETER
DEFINITION
Filter Name
Enter a name to identify the filtering rule
IP Version
Select the IP version to apply the filter to.
Protocol
Select the protocol type to block
Source IP Address/Subnet Mask
Enter the IP Address of the PC on the LAN to block
Source Port
Enter the port number used by the application to block
Destination IP Address/Subnet Mask
Enter the IP Address of the Remote Server to which connections should be blocked
Destination Port
Enter the destination port number used by the application to block
Click Save/Apply to take effect the settings. The new rule will then be displayed in the Outgoing IP Filtering table list.
Page 30 / 56
NETCOMM GATEWAY™ SERIES –
NB304N – ADSL2+ Wireless N300 Modem Router
30
NetComm NB304N – ADSL2+ Wireless N300 Modem
YML304X
www.netcomm.com.au
Incoming IP Filtering
By default, when NAT is enabled, all incoming IP traffic from WAN is blocked except for responses to requests from the LAN.
However, some incoming traffic from the Internet can be accepted by setting up Incoming IP Filtering rules.
To delete the rule, click Remove checkbox next to the selected rule and click Remove.
To create a new incoming IP filter, click Add. The Add IP Filter-Incoming page will be displayed.
Enter the following parameters:
PARAMETER
DEFINITION
Filter Name
Enter a name to identify the filtering rule
IP Version
Select the IP version to apply the filter to
Protocol
Select the protocol type to allow
Source IP Address/Subnet Mask
Enter the IP Address of the Remote Server from which to allow connections
Source Port
Enter the port number used by the application to allow
Destination IP Address/Subnet Mask
Enter the IP Address of the PC on the LAN to which connections should be allowed
Destination Port
Enter the destination port number used by the application to allow
WAN Interface
Select the WAN Interface to apply the filter to
Click Save/Apply to take effect the settings. The new rule will then be displayed in the Incoming IP Filtering table list.
MAC Filtering
The NB304N offers the ability to utilise MAC Address filtering on ATM PVCs. You can elect to block or allow connections based on
MAC Address criteria. The default policy is to allow connections which match the criteria. Click Add to enter a new MAC Address
filter.
1.
Enter the Protocol type to apply the filter to
2.
Enter the Source and Destination MAC Address
3.
Enter the direction of the traffic to filter
4.
Select the WAN interface to apply to the filter to.
Click Apply/Save to save the new MAC filtering configuration.

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