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Reference Manual for Cable/DSL Wireless Router WGR614
6-4
Advanced Configuration
Some online games and videoconferencing applications are incompatible with NAT. The WGR614
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
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 WGR614. However, certain
communications functions like VPN may require turning off the SPI feature.
•
Setting Up a Default DMZ Server
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Page 67 / 146
Reference Manual for Cable/DSL Wireless Router WGR614
Advanced Configuration
6-5
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.
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Page 68 / 146
Reference Manual for Cable/DSL Wireless Router WGR614
6-6
Advanced 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.
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.
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Page 69 / 146
Reference Manual for Cable/DSL Wireless Router WGR614
Advanced Configuration
6-7
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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Reference Manual for Cable/DSL Wireless Router WGR614
6-8
Advanced Configuration
•
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.
Using the Router as a DHCP server
By default, the router will function 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 router's LAN. The assigned default gateway address is the LAN address of the router. IP
addresses will be assigned to the attached PCs 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.
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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