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Page 91 / 180 Scroll up to view Page 86 - 90
Reference Manual for the 108 Mbps Wireless Media Router WGT634U
8-4
Advanced Configuration
April 2004, 202-10018-02
Some online games and videoconferencing applications are incompatible with NAT. The
WGT634U Wireless Media Router 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 in the Port Forwarding menu. If one local computer acts as a game or
videoconferencing host, enter its IP address as the default.
Configuring WAN Setup Options
The WAN Setup options let you configure a DMZ server, change the MTU size and enable the
wireless router to respond to a Ping on the WAN port. These options are discussed below.
Figure 8-2:
WAN Setup Menu
•
Connect Automatically, as Required
Normally, this option should be enabled. 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.
If disabled, you must connect manually, using the Connection Status button on the Router
Status screen. This manual connection will stay up all the time without time-outs.
Page 92 / 180
Reference Manual for the 108 Mbps Wireless Media Router WGT634U
Advanced Configuration
8-5
April 2004, 202-10018-02
•
Disable SPI Firewall
Normally, this option should be Enabled, so that your local network will be protected by the
Stateful Packet Inspection (SPI) firewall included in the WGT634U. However, certain
communications functions like VPN may require turning off the SPI feature.
•
Setting Up a Default DMZ Server
The default DMZ server feature is helpful when using some online games and
videoconferencing applications that are incompatible with NAT. The router 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 PC can run the application
properly if that PC’s IP address is entered as the default DMZ server.
Incoming traffic from the Internet is normally discarded by the router 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.
The WAN Setup menu lets you configure a 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 router 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 router to be discovered. Do not check this box unless you have a specific reason to do so.
•
Setting the MTU Size
The default MTU size is usually fine. The normal MTU (Maximum Transmit Unit) value for
most Ethernet networks is 1500 Bytes. For some ISPs, particularly some using PPPoE, you
may need to reduce the MTU. This should not be done unless you are sure it is necessary for
your ISP.
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.
Page 93 / 180
Reference Manual for the 108 Mbps Wireless Media Router WGT634U
8-6
Advanced Configuration
April 2004, 202-10018-02
Any packets sent through the router that are larger than the configured MTU size will be
repackaged into smaller packets to meet the MTU requirement. To change the MTU size:
Under MTU Size, enter a new size between 64 and 1500, for example, 1400. Then, click
Apply to save the new configuration.
Using a Dynamic DNS Service
If your network has a permanently assigned IP address, you can register a domain name and have
that name linked with your IP address by public Domain Name Servers (DNS). However, if your
Internet account uses a dynamically assigned IP address, you will not know in advance what your
IP address will be, and the address can change frequently. In this case, you can use a commercial
dynamic DNS service which will allow you to register your domain to their IP address, and will
forward traffic directed at your domain to whatever your current IP address happens to be.
The router contains a client that can connect to many popular dynamic DNS services. You can
select one of these services and obtain an account with them. Then, whenever your ISP-assigned
IP address changes, your router will automatically contact your dynamic DNS service provider,
log in to your account, and register your new IP address.
From the main menu of the browser interface, under Advanced, click on Dynamic DNS. To
configure Dynamic DNS:
1.
Register for an account with one of the dynamic DNS service providers whose names appear
in the ‘Select Service Provider’ box. For example, for dyndns.org, go to www.dyndns.org.
2.
Select the Use a Dynamic DNS service check box.
3.
Select the name of your dynamic DNS Service Provider.
4.
Type the Host Name (or domain name) that your dynamic DNS service provider gave you.
5.
Type the User Name for your dynamic DNS account.
6.
Type the Password (or key) for your dynamic DNS account.
Note:
If your ISP assigns a private WAN IP address (such as 192.168.x.x or 10.x.x.x),
the dynamic DNS service will not work because private addresses will not be routed on
the Internet.
Page 94 / 180
Reference Manual for the 108 Mbps Wireless Media Router WGT634U
Advanced Configuration
8-7
April 2004, 202-10018-02
7.
If your dynamic DNS provider allows the use of wildcards in resolving your URL, you can
select the Use wildcards check box to activate this feature. For example, the wildcard feature
will cause *.yourhost.dyndns.org to be aliased to the same IP address as yourhost.dyndns.org
8.
Click Apply to save your configuration.
Using LAN IP Setup Options
The LAN IP Setup feature is under the Advanced heading of the main menu. This feature allows
configuration of LAN IP services such as DHCP and RIP. From the main menu of the browser
interface, under Advanced, click LAN IP Setup to view the LAN IP Setup menu, shown below.
Figure 8-3:
LAN IP Setup Menu
The router is shipped preconfigured to use private IP addresses on the LAN side, and to act as a
DHCP server. The router’s default LAN IP configuration is:
•
LAN IP addresses — 192.168.1.1
•
Subnet mask — 255.255.255.0
Page 95 / 180
Reference Manual for the 108 Mbps Wireless Media Router WGT634U
8-8
Advanced Configuration
April 2004, 202-10018-02
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 router.
•
IP Subnet Mask
This is the LAN Subnet Mask of the router. 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 router sends and receives RIP packets.
Both is the default.
—
When set to Both or Out Only, the router will broadcast its routing table periodically.
—
When set to Both or In Only, it will incorporate the RIP information that it receives.
—
When set to None, it will not send any RIP packets and will ignore any RIP packets
received.
•
RIP Version
This controls the format and the broadcasting method of the RIP packets that the router 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. RIP-2B uses subnet broadcasting.
Note:
If you change the LAN IP address of the router while connected through the
browser, you will be disconnected. You may need to restart your computer for the new IP
address setting to take effect.

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