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Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102
Advanced Configuration of the WGX102
7-23
202-10042-02 v1.1
Router Mode WAN Setup Options
The WAN Setup options let you configure a DMZ server, change the MTU size and enable the
wireless range extender to respond to a Ping on the WAN port. These options are discussed below.
Figure 7-17:
WAN Setup menu.
Connect Automatically, as Required.
Normally, this option should be selected. An Internet
connection will be made automatically after each timeout, whenever Internet-bound traffic is
detected. This provides connection on demand and is potentially cost-saving in places in Europe
for example where Internet services charge by the minute.
If disabled, you must connect manually, using the Connection Status button on the Router Status
screen. This manual connection stays up all the time without timeouts.
Disable SPI Firewall.
The Stateful Packet Inspection (SPI) Firewall protects your LAN against
Denial of Service attacks. This should only be disabled in special circumstances.
Default DMZ Server.
The default DMZ server feature is helpful when using some online games
and videoconferencing applications that are incompatible with NAT. The WGX102 is programmed
to recognize some of these applications and to work properly with them, but there are other
applications that may not function well. In some cases, one local computer can run the application
properly if that computer’s IP address is entered as the default DMZ server.
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Page 92 / 169
Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102
7-24
Advanced Configuration of the WGX102
202-10042-02 v1.1
Incoming traffic from the Internet is normally discarded by the WGX102 unless the traffic is a
response to one of your local computers or a service that you have configured in the Ports menu.
Instead of discarding this traffic, you can have it forwarded to one computer on your network. This
computer is called the Default DMZ Server.
To assign a computer or server to be a Default DMZ server, follow these steps:
1.
Click WAN Setup link on the Advanced section of the main menu.
2.
Type the IP address for that server. To remove the default DMZ server, replace the IP address
numbers with all zeros.
3.
Click
Apply
.
Respond to Ping on Internet WAN Port.
If you want the WGX102 to respond to a 'ping' from the
Internet, select the Respond to Ping on Internet WAN Port check box. This should only be used as
a diagnostic tool, since it allows your wireless range extender to be discovered. Do not select this
check box unless you have a specific reason to do so.
MTU Size.
The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500
Bytes, 1492 Bytes for PPPoE connections, or 1436 for PPTP connections. For some ISPs you may
need to reduce the MTU. But this is rarely required, and should not be done unless you are sure it
is necessary for your ISP connection.
Any packets sent through the wireless range extender that are larger than the configured MTU size
are repackaged into smaller packets to meet the MTU requirement. To change the MTU size:
1.
Under MTU Size, enter a new size between 64 and 1500.
2.
Click
Apply
to save the new configuration.
Router Mode LAN IP Setup Options
LAN IP Setup is under the Advanced heading on both the Access Point Mode and Router Mode
menus. If you are using the WGX102 in Access Point Mode, see
“Configuring the LAN IP Setup
Options in Access Point Mode” on page 3-16
for configuration information.
Note:
DMZ servers pose a security risk. A computer designated as the default DMZ
server loses much of the protection of the firewall, and is exposed to exploits from the
Internet. If compromised, the DMZ server can be used to attack your network.
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Page 93 / 169
Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102
Advanced Configuration of the WGX102
7-25
202-10042-02 v1.1
This menu allows configuration of LAN IP services such as DHCP and RIP in Router Mode. From
the main menu of the browser interface, under Advanced, click LAN IP Setup to view the LAN IP
Setup menu, shown below.
Figure 7-18:
LAN IP Setup menu in Router Mode
The wireless range extender’s default LAN IP configuration is:
•
LAN IP addresses—192.168.0.101
•
Subnet mask—255.255.255.0
These addresses are part of the IETF-designated private address range for use in private networks,
and should be suitable in most applications. If your network has a requirement to use a different IP
addressing scheme, you can make those changes in this menu.
The LAN IP parameters are:
•
IP Address
This is the LAN IP address of the wireless range extender.
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Page 94 / 169
Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102
7-26
Advanced Configuration of the WGX102
202-10042-02 v1.1
•
IP Subnet Mask
This is the LAN Subnet Mask of the wireless range extender. Combined with the IP address,
the IP Subnet Mask allows a device to know which other addresses are local to it, and which
must be reached through a gateway or router.
•
RIP Direction
RIP (Router Information Protocol) allows a router to exchange routing information with other
routers. The RIP Direction selection controls how the WGX102 sends and receives RIP
packets. Both is the default.
—
When set to Both or Out Only, the WGX102 broadcasts its routing table periodically.
—
When set to Both or In Only, it incorporates the RIP information that it receives.
—
When set to None, it does not send any RIP packets and ignores any RIP packets received.
•
RIP Version
This controls the format and the broadcasting method of the RIP packets that the WGX102
sends. (It recognizes both formats when receiving.) By default, this is set for RIP-1.
—
RIP-1 is universally supported. RIP-1 is probably adequate for most networks, unless you
have an unusual network setup.
—
RIP-2 carries more information. Both RIP-2B and RIP-2M send the routing data in RIP-2
format.
•
RIP-2B uses subnet broadcasting.
•
RIP-2M uses multicasting. Multicasting can reduce the load on non-router machines
because they do not listen to the RIP multicast address and do not receive the RIP
packets. However, if one router uses multicasting, then all routers on your network
must use multicasting.
Note:
If you change the LAN IP address of the WGX102 while connected through the
browser, you will be disconnected. You must then open a new connection to the new IP
address and log in again.
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Page 95 / 169
Reference Manual for the 54 Mbps Wall-Plugged Wireless Range Extender WGX102
Advanced Configuration of the WGX102
7-27
202-10042-02 v1.1
Using the WGX102 in Router Mode as a DHCP server
By default, the WGX102 functions as a DHCP (Dynamic Host Configuration Protocol) server,
allowing it to assign IP, DNS server, and default gateway addresses to all computers connected to
the wireless range extender's LAN. The assigned default gateway address is the LAN address of
the WGX102 IP addresses are assigned to the attached computers from a pool of addresses
specified in this menu. Each pool address is tested before it is assigned to avoid duplicate
addresses on the LAN.
For most applications, the default DHCP and TCP/IP settings of the wireless range extender are
satisfactory. See
“IP Configuration by DHCP”
on
page B-10
for an explanation of DHCP and
information about how to assign IP addresses for your network.
If another device on your network is the DHCP server, or if you manually configure the network
settings of all of your computers, clear the ‘Use router as DHCP server’ check box. Otherwise,
leave it selected.
To specify the pool of IP addresses to be assigned, set the Starting IP Address and Ending IP
Address. These addresses should be part of the same IP address subnet as the wireless range
extender’s LAN IP address. Using the default addressing scheme, you should define a range
between 192.168.0.2 and 192.168.0.253, although you may want to save part of the range for
devices with fixed addresses.
The WGX102 delivers the following parameters to any LAN device that requests DHCP:
•
An IP Address from the range you have defined
•
Subnet Mask
•
Gateway IP Address (the wireless range extender’s LAN IP address)
•
Primary DNS Server (if you entered a Primary DNS address in the Basic Settings menu;
otherwise, the wireless range extender’s LAN IP address)
•
Secondary DNS Server (if you entered a Secondary DNS address in the Basic Settings menu)
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