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Page 86 / 126 Scroll up to view Page 81 - 85
Advanced Settings
86
N900 Wireless Dual Band Gigabit Router R4500
Wireless repeater
. The 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 router is always in dual-band concurrent mode, unless you turn off one radio. 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 the other radio band as a wireless 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 encryption 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 to operate in the
same LAN network address range as the access points.
Wireless Repeating Function
1.
Select
Advanced > Advanced Setup > Wireless Repeating
:
Scroll to view
more settings
2.
View or change the wireless repeater settings for the router:
•
Enable Wireless Repeating Function
. Select the check box for the 2.4 GHz or 5
GHz network to use the wireless repeating function.
•
Wireless MAC of this router
. This field displays the MAC address for your router for
your reference. You have to enter this MAC address in the corresponding Wireless
Repeating Function screen of the other access point you are using.
•
Wireless Repeater
. If your router is the repeater, select this radio button.
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Advanced Settings
87
N900 Wireless Dual Band Gigabit Router R4500
•
Repeater IP Address
. If your router is the repeater, enter the IP address of the
other access point.
•
Disable Wireless Client Association
. If your 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.
•
Base Station MAC Address
. If your router is the repeater, enter the MAC
address for the access point that is the base station.
•
Wireless Base Station
. If your router is the base station, select this radio button.
•
Disable Wireless Client Association
. If your 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 router is the base station, it can
act as the “parent” of up to 4 other access points. Enter the MAC addresses of the
other access points in these fields.
3.
Click
Apply
to save your settings.
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 the same wireless settings (SSID, mode, channel, and security).
The wireless security option has to be set to None or WEP.
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Advanced Settings
88
N900 Wireless Dual Band Gigabit Router R4500
2.
Select
Advanced > Advanced Setup > Wireless Repeating Function
:
Scroll to
view more
settings
3.
For the frequency you 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 settings.
Set Up a Repeater Unit
Use a wired Ethernet connection to set up the repeater unit to avoid conflicts with the wireless
connection to the base station.
Note:
If you are using the base station with a non-NETGEAR router as the
repeater, you might need to change more configuration settings. In
particular, you should disable the DHCP server function on the
wireless repeater AP.
To configure the router as a repeater unit:
1.
Log in to the 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 > Wireless Repeating Function
, and select the
Enable Wireless
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 address of the base station.
4.
Click
Apply
to save your settings.
Page 89 / 126
Advanced Settings
89
N900 Wireless Dual Band Gigabit Router R4500
5.
Verify connectivity across the LANs.
A computer on that joins the network can connect to the Internet or share files and
printers with computers and servers connected to the other access point.
Port Forwarding and Port Triggering
By default, the 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 the router does not
recognize their replies.
Your 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 router a message containing the source and destination address and
process information. Before forwarding your message to the remote computer, your 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 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 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 router stores the original
information and then modifies the source information in the request message, performing
Network Address Translation (NAT):
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Advanced Settings
90
N900 Wireless Dual Band Gigabit Router R4500
•
The source address is replaced with your 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 router, such as
33333. This is necessary because two computers could independently be using the
same session number.
Your 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 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 router.
Destination port number
. 33333.
5.
Upon receiving the incoming message, your router checks its session table to determine if
there is an active session for port number 33333. Finding an active session, the router then
modifies the message to restore the original address information replaced by NAT. Your
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 router eventually detects a period of inactivity in
the communications. Your 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 router from a
particular service port number, and replies from the remote computer to your router are
directed to that port number. If the remote server sends a reply to a different port number,
your router does not recognize it and discards it. However, some application servers (such as
FTP and IRC servers) send replies to multiple port numbers. Using the port triggering
function of your router, you can tell the router to open more 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

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