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Page 51 / 116 Scroll up to view Page 46 - 50
Wireless-G Router WGR614v9 Reference Manual
Customizing Your Network Settings
4-3
v1.1, May 2008
Specify the pool of IP addresses to be assigned by setting the starting IP address and ending IP
address. These addresses should be part of the same IP address subnet as the router’s LAN IP
address. Using the default addressing scheme, you should define a range between 192.168.1.2 and
192.168.1.254, although you might wish to save part of the range for devices with fixed addresses.
The router 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 router’s LAN IP address)
•
Primary DNS server (if you entered a primary DNS address in the Basic Settings screen;
otherwise, the router’s LAN IP address)
•
Secondary DNS server (if you entered a secondary DNS address in the Basic Settings screen)
To use another device on your network as the DHCP server, or to manually specify the network
settings of all of your computers, clear the
Use Router as DHCP Server
check box. Otherwise,
leave it selected. If this service is not selected and no other DHCP server is available on your
network, you need to set your computers’ IP addresses manually or they will not be able to access
the router.
Using Address Reservation
When you specify a reserved IP address for a computer on the LAN, that computer always
receives the same IP address each time it accesses the router’s DHCP server. Reserved IP
addresses should be assigned to computers or servers that require permanent IP settings.
To reserve an IP address:
1.
Click
Add
.
2.
In the
IP Address
field, type the IP address to assign to the computer or server. (Choose an IP
address from the router’s LAN subnet, such as
192.168.1.x
.)
3.
Type the MAC address of the computer or server.
Tip:
If the computer is already present on your network, you can copy its MAC
address from the Attached Devices screen and paste it here.
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Wireless-G Router WGR614v9 Reference Manual
4-4
Customizing Your Network Settings
v1.1, May 2008
4.
Click
Apply
to enter the reserved address into the table.
To edit or delete a reserved address entry:
1.
Click the button next to the reserved address you want to edit or delete.
2.
Click
Edit
or
Delete
.
Using a Dynamic DNS Service
If your Internet Service Provider (ISP) gave you 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 do
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 allows you to register your domain
to their IP address, and forwards traffic directed at your domain to your frequently changing IP
address.
Your router contains a client that can connect to the Dynamic DNS service provided by
DynDNS.org. You must first visit their website at
www.dyndns.org
and obtain an account and host
name, which you specify in the router. Then, whenever your ISP-assigned IP address changes,
your router automatically contacts the Dynamic DNS service provider, logs in to your account, and
registers your new IP address. If your host name is hostname, for example, you can reach your
router at hostname.dyndns.org.
Note:
The reserved address is not assigned until the next time the computer contacts
the router’s DHCP server. Reboot the computer or access its IP configuration
and force a DHCP release and renew.
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 are not routed on
the Internet.
Page 53 / 116
Wireless-G Router WGR614v9 Reference Manual
Customizing Your Network Settings
4-5
v1.1, May 2008
From the main menu of the browser interface, under Advanced, select
Dynamic DNS
to display
the Dynamic DNS screen.
To configure Dynamic DNS:
1.
Register for an account with one of the Dynamic DNS service providers whose names appear
in the
Service Provider
list. For example, for DynDNS.org, select
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. This is the name that you use to log in to
your account, not your host name.
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 can
select the
Use Wildcards
check box to activate this feature.
For example, the wildcard feature causes *.yourhost.dyndns.org to be aliased to the same IP
address as yourhost.dyndns.org.
8.
Click
Apply
to save your configuration.
Figure 4-2
Page 54 / 116
Wireless-G Router WGR614v9 Reference Manual
4-6
Customizing Your Network Settings
v1.1, May 2008
Configuring the WAN Setup Options
The WAN Setup options let you configure a DMZ (demilitarized zone) server, change the
Maximum Transmit Unit (MTU) size, and enable the wireless router to respond to a ping on the
WAN (Internet) port. From the main menu of the browser interface, under Advanced, click
WAN
Setup
to view the WAN Setup screen.
Disabling the SPI Firewall
The Stateful Packet Inspection (SPI) firewall protects your network and computers against attacks
and intrusions. A stateful packet firewall carefully inspects incoming traffic packets, looking for
known exploits such as malformed, oversized, or out-of-sequence packets. The firewall should be
disabled only in special circumstances, such as when you are troubleshooting application issues.
Setting Up a Default DMZ Server
The default DMZ server feature is helpful when you are using some online games and
videoconferencing applications that are incompatible with Network Address Translation (NAT).
The router is programmed to recognize some of these applications and to work correctly with
Figure 4-3
Page 55 / 116
Wireless-G Router WGR614v9 Reference Manual
Customizing Your Network Settings
4-7
v1.1, May 2008
them, but there are other applications that might not function well. In some cases, one local
computer can run the application correctly if that computer’s IP address is entered as the default
DMZ server.
Incoming traffic from the Internet is usually 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 Port Forwarding/Port
Triggering screen. 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 screen lets you configure a default DMZ server.
To assign a computer or server to be a default DMZ server:
1.
In the last
Default DMZ Server
field, type the last digit of the IP address for that computer.
To remove the default DMZ server, enter 0 (zero).
2.
Select the
Default DMZ Server
check box, and click
Apply
.
Responding to a Ping on the Internet (WAN) Port
If you want the router to respond to a ping from the Internet, select the
Respond to Ping on
Internet Port
check box. This should be used only as a diagnostic tool, since it allows your router
to be discovered by Internet scanners. Do not select this check box unless you have a specific
reason to do so, such as when troubleshooting your connection.
Setting the MTU Size
The normal MTU value for most Ethernet networks is 1500 bytes, 1492 bytes for PPPoE
connections, or 1450 for PPTP connections. For some ISPs, you might need to reduce the MTU
size, but this is rarely required and should not be done unless you are sure it is necessary for your
ISP connection. For more information, see
“Changing the MTU Size” on page 5-15
.
To change the MTU size:
1.
In the
MTU Size
field, enter a new size between 64 and 1500.
2.
Click
Apply
to save the new configuration.
Warning:
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 computer can be used to
attack other computers on your network.

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