Netgear Dgnd3700v2 N600 Wireless Dual Band Gigabit Adsl2 Plus Modem Router User Manual

							Advanced Settings 101
 N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
Wireless Repeating Function (WDS)
You can set the N600 Modem Router up to be used as a wireless access poin\
t (AP). Doing 
this enables the wireless modem router to act as a wireless repeater. A wireless repeater 
connects to another wireless wireless modem router as a client where the\
 network to which it 
connects becomes the ISP service.
Wireless repeating is a type of Wireless Distribution System (WDS). A WDS allows a wireless 
network to be expanded through multiple access points instead of using a\
 wired backbone to 
link them. 

The following figure shows a wireless repeating scenario.
Repeater
Base station
access point
access point
Figure 11. Wireless repeating scenario
Note: If you use the wireless repeating function, you need to select either 
WEP or None as a security option in the Wireless Settings screen. 
The WEP option displays only if you select the wireless mode  Up to 
54 Mbps in the Wireless Settings screen.
Wireless Base Station . 
 The wireless modem router acts as the parent access point, 
bridging traffic to and from the child repeater access point, as well as handling wir\
eless and 
wired local computers. To configure this mode, you have to know the MAC addresses of the 
child repeater access point. 
						

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N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2 
Wireless Repeater
. The wireless modem router sends all traffic from its local wireless or 
wired computers to a remote access point. To configure this mode, you have to know the 
MAC address of the remote parent access point. 
The DGND3700v2 wireless modem router is always in dual-band concurrent m\
ode, unless  you turn of
 f one radio. Be aware that if you enable the wireless repeater in either\
 radio band, 
the wireless base station or wireless repeater cannot be enabled in the \
other radio band. 
However, if you enable the wireless base station in either radio band and use t\
he other radio 
band as a wireless wireless modem router or wireless base station, dual-\
band concurrent 
mode is not affected.
For you to set up a wireless network with WDS, 
the following conditions have to be met for 
both access points:
• Both access points have to use the same SSID, wireless channel, and encr\
yption mode.
• Both access points have to be on the same LAN IP subnet. 
 That is, all the access point 
LAN IP addresses are in the same network.
• All LAN devices (wired and wireless computers) have to be configured t\
o operate in the 
same LAN network address range as the access points.
Wireless Repeating Function 
Select  Advanced > Advanced Setup > Wireless Repeating Function  to view or change 
wireless repeater settings for the wireless modem router.
• Enable Wireless Repeating Function . Select the check box for the 2.4 GHz or 5 GHz 
network to use the wireless repeating function. 
						

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103  N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
Disable Wireless Client Association. If your wireless modem router is the repeater, 
selecting this check box means that wireless clients cannot associate with it. Only LAN 
client associations are allowed.
-If you are setting up a point-to-point bridge, select this check box. 
-If you want all client traffic to go through the other access point (repeater with wireless 
client association), leave this check box cleared.
•Wireless MAC of this router. This field displays the MAC address for your wireless 
modem router for your reference. You will need to enter this MAC address in the 
corresponding Wireless Repeating Function screen of the other access point you are 
using.
•Wireless Repeater. If your wireless modem router is the repeater, select this radio 
button.
Repeater IP Address. If your wireless modem router is the repeater, enter the IP 
address of the other access point.
Base Station MAC Address. If your wireless modem router is the repeater, enter the 
MAC address for the access point that is the base station.
•Wireless Base Station. If your wireless modem router is the base station, select this 
radio button.
Disable Wireless Client Association. If your wireless modem router is the base station, 
selecting this check box means that wireless clients cannot associate with it. Only LAN 
client associations are allowed.
Repeater MAC Address (1 through 4). If your wireless modem router is the base 
station, it can act as the “parent” of up to four other access points. Enter the MAC 
addresses of the other access points in these fields.
Set Up the Base Station 
The wireless repeating function works only in hub and spoke mode. The units cannot be 
daisy-chained. You have to know the wireless settings for both units. You have to know the 
MAC address of the remote unit. First, set up the base station, and then set up the repeater.
To set up the base station:
1. Set up both units with exactly the same wireless settings (SSID, mode, channel, and 
security). Note that the wireless security option has to be set to None or WEP. 
						

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N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2 
2. 
Select  Advanced > Advanced Setup > Wireless Repeating Function  to display the 
Wireless Repeating Function screen.
Scroll to view 
more settings
3.  In the Wireless Repeating Function screen (depending on the frequency y\
ou want to use), 
select the  Enable Wireless Repeating Function  check box and select the Wireless Base 
Station radio button.
4.  Enter the MAC address for one or more repeater units.
5.  Click  Apply  to save your changes.
Set Up a Repeater Unit
Use a wired Ethernet connection to set up the repeater unit to avoid con\
flicts with the 
wireless connection to the base station.
Note: If you are using the DGND3700v2 base station with a non-NETGEAR 
wireless modem router as the repeater, you might need to change 
additional configuration settings. In particular, you should disable the 
DHCP server function on the wireless repeater   AP.
To configure the wireless modem router as a repeater unit:
1. Log in to the wireless modem router that will be the repeater
 . Select Basic > Wireless 
Settings  and verify that the wireless settings match the base unit exactly. The wireless 
security option has to be set to WEP or None.
2.  Select  Advanced >  Advanced Setup > W ireless Repeating Function, and select the 
Enable W
 ireless Repeating Function check box  and the Wireless Repeater radio button.
3.  Fill in the Repeater IP 
 Address field. This IP address has to be in the same subnet as the 
base station, but different from the LAN IP of the base station. 
						

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105  N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
4. Click Apply to save your changes.
5. Verify connectivity across the LANs. 
A computer on any wireless or wired LAN segment of the wireless modem router should 
be able to connect to the Internet or share files and printers with any other wireless or 
wired computer or server connected to the other access point.
Port Forwarding and Triggering
By default, the wireless modem router blocks inbound traffic from the Internet to your 
computers except replies to your outbound traffic. You might need to create exceptions to 
this rule for these purposes:
•To allow remote computers on the Internet to access a server on your local network. 
•To allow certain applications and games to work correctly when their replies are not 
recognized by your wireless modem router.
Your wireless modem router provides two features for creating these exceptions: port 
forwarding and port triggering. The next sections provide background information to help you 
understand how port forwarding and port triggering work, and the differences between the 
two.
Remote Computer Access Basics
When a computer on your network needs to access a computer on the Internet, your 
computer sends your wireless modem router a message containing the source and 
destination address and process information. Before forwarding your message to the remote 
computer, your wireless modem router has to modify the source information and create and 
track the communication session so that replies can be routed back to your computer. 
Here is an example of normal outbound traffic and the resulting inbound responses:
1. You open a browser, and your operating system assigns port number 5678 to this 
browser session. 
2. You type http://www.example.com into the URL field, and your computer creates a web 
page request message with the following address and port information. The request 
message is sent to your wireless modem router.
Source address. Your computer’s IP address.
Source port number. 5678, which is the browser session. 
Destination address. The IP address of www.example.com, which your computer finds 
by asking a DNS server.
Destination port number. 80, which is the standard port number for a web server 
process.
3. Your wireless modem router creates an entry in its internal session table describing this 
communication session between your computer and the web server at www.example.com. 
Before sending the web page request message to www.example.com, your wireless  
						

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106 N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2 
modem router stores the original information and then modifies the source information in the 
request message, performing Network Address Translation (NAT):
•The source address is replaced with your wireless modem router’s public IP address. 
This is necessary because your computer uses a private IP address that is not 
globally unique and cannot be used on the Internet.
•The source port number is changed to a number chosen by the wireless modem 
router, such as 33333. This is necessary because two computers could independently 
be using the same session number.
Your wireless modem router then sends this request message through the Internet to the 
web server at www.example.com.
4. The web server at www.example.com composes a return message with the requested web 
page data. The return message contains the following address and port information. The 
web server then sends this reply message to your wireless modem router.
Source address. The IP address of www.example.com.
Source port number. 80, which is the standard port number for a web server process.
Destination address. The public IP address of your wireless modem router.
Destination port number. 33333.
5. Upon receiving the incoming message, your wireless modem router checks its session 
table to determine whether there is an active session for port number 33333. Finding an 
active session, the wireless modem router then modifies the message to restore the original 
address information replaced by NAT. Your wireless modem router sends this reply 
message to your computer, which displays the web page from www.example.com. The 
message now contains the following address and port information.
Source address. The IP address of www.example.com.
Source port number. 80, which is the standard port number for a web server process.
Destination address. Your computer’s IP address.
Destination port number. 5678, which is the browser session that made the initial 
request.
6. When you finish your browser session, your wireless modem router eventually detects a 
period of inactivity in the communications. Your wireless modem router then removes the 
session information from its session table, and incoming traffic is no longer accepted on port 
number 33333.
Port Triggering to Open Incoming Ports
In the preceding example, requests are sent to a remote computer by your wireless modem 
router from a particular service port number, and replies from the remote computer to your 
wireless modem router are directed to that port number. If the remote server sends a reply 
back to a different port number, your wireless modem router does not recognize it and 
discards it. However, some application servers (such as FTP and IRC servers) send replies 
back to multiple port numbers. Using the port triggering function of your wireless modem  
						

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107  N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
router, you can tell the wireless modem router to open additional incoming ports when a 
particular outgoing port originates a session.
An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at 
destination port 6667. The IRC server not only responds to your originating source port, but 
also sends an “identify” message to your computer on port 113. Using port triggering, you can 
tell the wireless modem router, “When you initiate a session with destination port 6667, you 
have to also allow incoming traffic on port 113 to reach the originating computer.” Using steps 
similar to the preceding example, the following sequence shows the effects of the port 
triggering rule you have defined:
1. You open an IRC client program to start a chat session on your computer. 
2. Your IRC client composes a request message to an IRC server using a destination port 
number of 6667, the standard port number for an IRC server process. Your computer then 
sends this request message to your wireless modem router.
3. Your wireless modem router creates an entry in its internal session table describing this 
communication session between your computer and the IRC server. Your wireless modem 
router stores the original information, performs Network Address Translation (NAT) on the 
source address and port, and sends this request message through the Internet to the IRC 
server. 
4. Noting your port triggering rule and having observed the destination port number of 6667, 
your wireless modem router creates an additional session entry to send any incoming port 
113 traffic to your computer.
5. The IRC server sends a return message to your wireless modem router using the 
NAT-assigned source port (as in the previous example, say port 33333) as the destination 
port. The IRC server also sends an identify message to your wireless modem router with 
destination port 113.
6. Upon receiving the incoming message to destination port 33333, your wireless modem 
router checks its session table to determine whether there is an active session for port 
number 33333. Finding an active session, the wireless modem router restores the original 
address information replaced by NAT and sends this reply message to your computer.
7. Upon receiving the incoming message to destination port 113, your wireless modem router 
checks its session table and learns that there is an active session for port 113, associated 
with your computer. The wireless modem router replaces the message’s destination IP 
address with your computer’s IP address and forwards the message to your computer.
8. When you finish your chat session, your wireless modem router eventually senses a period 
of inactivity in the communications. The wireless modem router then removes the session 
information from its session table, and incoming traffic is no longer accepted on port 
numbers 33333 or 113.
To configure port triggering, you need to know which inbound ports the application needs. 
Also, you need to know the number of the outbound port that will trigger the opening of the 
inbound ports. You can usually determine this information by contacting the publisher of the 
application or user groups or newsgroups.
Note:Only one computer at a time can use the triggered application. 
						

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108 N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2 
Port Forwarding to Permit External Host Communications
In both of the preceding examples, your computer initiates an application session with a 
server computer on the Internet. However, you might need to allow a client computer on the 
Internet to initiate a connection to a server computer on your network. Normally, your wireless 
modem router ignores any inbound traffic that is not a response to your own outbound traffic. 
You can configure exceptions to this default rule by using the port forwarding feature. 
A typical application of port forwarding can be shown by reversing the client-server 
relationship from the previous web server example. In this case, a remote computer’s 
browser needs to access a web server running on a computer in your local network. Using 
port forwarding, you can tell the wireless modem router, “When you receive incoming traffic 
on port 80 (the standard port number for a web server process), forward it to the local 
computer at 192.168.1.123.” The following sequence shows the effects of the port forwarding 
rule you have defined:
1. The user of a remote computer opens a browser and requests a web page from 
www.example.com, which resolves to the public IP address of your wireless modem 
router. The remote computer composes a web page request message with the following 
destination information: 
Destination address. The IP address of www.example.com, which is the address of your 
wireless modem router.
Destination port number. 80, which is the standard port number for a web server 
process.
The remote computer then sends this request message through the Internet to your 
wireless modem router.
2. Your wireless modem router receives the request message and looks in its rules table for 
any rules covering the disposition of incoming port 80 traffic. Your port forwarding rule 
specifies that incoming port 80 traffic should be forwarded to local IP address 192.168.1.123. 
Therefore, your wireless modem router modifies the destination information in the request 
message:
The destination address is replaced with 192.168.1.123.
Your wireless modem router then sends this request message to your local network.
3. Your web server at 192.168.1.123 receives the request and composes a return message 
with the requested web page data. Your web server then sends this reply message to your 
wireless modem router.
4. Your wireless modem router performs Network Address Translation (NAT) on the source IP 
address, and sends this request message through the Internet to the remote computer, 
which displays the web page from www.example.com.
To configure port forwarding, you need to know which inbound ports the application needs. 
You usually can determine this information by contacting the publisher of the application or 
the relevant user groups and newsgroups. 
						

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109  N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2
How Port Forwarding Differs from Port Triggering
The following points summarize the differences between port forwarding and port triggering:
•Port triggering can be used by any computer on your network, although only one 
computer can use it at a time.
•Port forwarding is configured for a single computer on your network.
•Port triggering requires that you know the computer’s IP address in advance. The IP 
address is captured automatically.
•Port forwarding requires that you specify the computer’s IP address during configuration, 
and the IP address can never change.
•Port triggering requires specific outbound traffic to open the inbound ports, and the 
triggered ports are closed after a period of no activity.
•Port forwarding is always active and does not need to be triggered.
Set Up Port Forwarding to Local Servers
Using the port forwarding feature, you can allow certain types of incoming traffic to reach 
servers on your local network. For example, you might want to make a local web server, FTP 
server, or game server visible and available to the Internet.
Use the Port Forwarding/Port Triggering screen to configure the wireless modem router to 
forward specific incoming protocols to computers on your local network. In addition to servers 
for specific applications, you can also specify a default DMZ server to which all other 
incoming protocols are forwarded.
Before starting, you need to determine which type of service, application, or game you want 
to provide, and the local IP address of the computer that will provide the service. The server 
computer has to always have the same IP address.
To set up port forwarding:
Tip:To ensure that your server computer always has the same IP 
address, use the reserved IP address feature of your N600 Modem 
Router.  
						

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N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700v2 
1. 
Select  Advanced > Advanced Setup > Port Forwarding/Port Triggering  to display 
the following screen:
Port Forwarding is selected as the service type.
2.  Click  Add to display the following screen:
3. From the Service list, select the service or game that you will host on \
your network. If the 
service does not appear in the list, see  Add a Custom Service on page 111.
4.  From the 
 Action list, select the action that you want.