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Page 71 / 152 Scroll up to view Page 66 - 70
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
Advanced Configuration
6-3
M-10153-01
Local Web and FTP Server Example
If a local PC with a private IP address of 192.168.0.33 acts as a web and FTP server, configure the
Ports menu to forward HTTP (port 80) and FTP (port 21) to local address 192.168.0.33
In order for a remote user to access this server from the Internet, the remote user must know the IP
address that has been assigned by your ISP. If this address is 172.16.1.23, for example, an Internet
user can access your web server by directing the browser to http://172.16.1.23. The assigned IP
address can be found in the Maintenance Status Menu, where it is shown as the WAN IP Address.
Some considerations for this application are:
•
If your account’s IP address is assigned dynamically by your ISP, the IP address may change
periodically as the DHCP lease expires.
•
If the IP address of the local PC is assigned by DHCP, it may change when the PC is rebooted.
To avoid this, you can manually configure the PC to use a fixed address.
•
Local PCs must access the local server using the PCs’ local LAN address (192.168.0.33 in this
example). Attempts by local PCs to access the server using the external IP address
(172.16.1.23 in this example) will fail.
Multiple Computers for Half Life, KALI or Quake III Example
To set up an additional computer to play Half Life, KALI or Quake III:
1.
Click the button of an unused port in the table.
2.
Select the game again from the Service Name list.
3.
Change the beginning port number in the Start Port box.
For these games, use the supplied number in the default listing and add +1 for each additional
computer. For example, if you've already configured one computer to play Hexen II (using
port 26900), the second computer's port number would be 26901, and the third computer
would be 26902.
4.
Type the same port number in the End Port box that you typed in the Start Port box.
5.
Type the IP address of the additional computer in the Server IP Address box.
6.
Click Apply.
Page 72 / 152
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
6-4
Advanced Configuration
M-10153-01
Some online games and videoconferencing applications are incompatible with NAT. The WGT624
v2 wireless 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 in the PORTS
Menu. If one local PC 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 6-2:
WAN Setup menu.
•
Connect Automatically, as Required
Normally, this option should be Enabled, so that an Internet connection will be made
automatically, whenever Internet-bound traffic is detected. In locations where Internet access
is billed by the minute, if this causes high connection costs, you can disable this setting.
If disabled, you must connect manually, using the sub-screen accessed from the Router Status
menu “Show WAN Status” screen.
•
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 WGT624 v2. However, certain
communications functions like VPN may require turning off the SPI feature.
•
Setting Up a Default DMZ Server
Page 73 / 152
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
Advanced Configuration
6-5
M-10153-01
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, shown below 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, click 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. Don't 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.
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. Then, click Apply to save the new
configuration.
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 74 / 152
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
6-6
Advanced Configuration
M-10153-01
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.
7.
If your dynamic DNS provider allows the use of wildcards in resolving your URL, you may
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.
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 75 / 152
Reference Manual for the 108 Mbps Wireless Firewall Router WGT624 v2
Advanced Configuration
6-7
M-10153-01
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 on LAN IP Setup to view the LAN IP Setup menu, shown below.
Figure 6-3:
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—192.168.0.1
•
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:

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