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Page 76 / 149 Scroll up to view Page 71 - 75
RangeMax™ Dual Band Wireless-N Gigabit Router WNDR3700 User Manual
Customizing Your Network Settings
5-4
v1.3, October 2009
Using the Router as a DHCP Server
By default, the router functions as a DHCP 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. The router assigns IP addresses to the attached computers
from a pool of addresses specified in this screen. 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 router are satisfactory. Click
the link to the online document
“TCP/IP Networking Basics” in Appendix B
for an explanation of
DHCP and information about how to assign IP addresses for your network.
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 configure 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 will need to set your computers’ IP addresses manually or they will not be able to
access the router.
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
.
Page 77 / 149
RangeMax™ Dual Band Wireless-N Gigabit Router WNDR3700 User Manual
Customizing Your Network Settings
5-5
v1.3, October 2009
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.
4.
Click
Apply
to enter the reserved address into the table.
To edit or delete a reserved address entry:
1.
Select the radio 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 configure in the router. Then, whenever your ISP-assigned IP address changes,
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.
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 78 / 149
RangeMax™ Dual Band Wireless-N Gigabit Router WNDR3700 User Manual
Customizing Your Network Settings
5-6
v1.3, October 2009
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.
From the main menu, 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 5-2
Page 79 / 149
RangeMax™ Dual Band Wireless-N Gigabit Router WNDR3700 User Manual
Customizing Your Network Settings
5-7
v1.3, October 2009
Configuring the WAN Setup Options
The WAN Setup screen lets 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, under Advanced, click
WAN Setup
to view the WAN
Setup screen.
The WAN Setup fields are described in the following table:
Figure 5-3
Table 5-2.
WAN Setup Settings
Setting
Description
Disable 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.
Default DMZ Server
This feature is sometimes helpful when you are using some online games and
videoconferencing. Be careful when using this feature because it makes the
firewall security less effective. See the following section,
Configuring Static
Routes
.
Respond to Ping on Internet
Port
If you want the wireless router to respond to a ping from the Internet, select
this check box. This should be used only as a diagnostic tool, since it allows
your wireless router to be discovered. Do not select this check box unless you
have a specific reason to do so.
MTU Size (in bytes)
The normal MTU (Maximum Transmit Unit) value for most Ethernet networks
is 1500 bytes, or 1492 Bytes for PPPoE connections. For some ISPs you
might need to reduce the MTU. This is rarely required, and should not be done
unless you are sure it is necessary for your ISP connection. See
“Changing
the MTU Size” on page 6-6
.
Page 80 / 149
RangeMax™ Dual Band Wireless-N Gigabit Router WNDR3700 User Manual
Customizing Your Network Settings
5-8
v1.3, October 2009
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
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.
Click the
Default DMZ Server
check box.
2.
Type the IP address.
NAT Filtering
Network Address Translation (NAT) determines how the router processes
inbound traffic. Secured NAT provides a secured firewall to protect the
computers on the LAN from attacks from the Internet, but might prevent some
Internet games, point-to-point applications, or multimedia applications from
functioning. Open NAT provides a much less secured firewall, but allows
almost all Internet applications to function.
Disable SIP ALG
Select this feature if you have a SIP (Session Initiation Protocol) telephone or
other SIP base devices, and you want them to communicate with other
people. If you have been unable to build a successful SIP connection,
selecting this check box allows for such a connection without compromising
other SIP ALG (Application-level gateway) firewall settings, such as Disable
SPI Firewall. If you are not using SIP devices, leave this check box
unchecked.
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.
Table 5-2.
WAN Setup Settings
Setting
Description

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