NETGEAR WPNT834 Router Manual PDF (Setup & Configuration Guide)

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Reference Manual for the RangeMax 240 Wireless Router WPNT834

8-12

Advanced Configuration of the Router

v1.0, November 2005

Disabling the SPI Firewall

The SPI (Stateful Inspection) Firewall protects your LAN against Denial of Service attacks. This

should only be disabled in special circumstances.

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 computer can run the application properly if that computer’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 Port

Forwarding / Port Triggering 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 in 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

.

Responding to a Ping on the 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. Do not check this box unless you have a specific reason to do so.

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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Reference Manual for the RangeMax 240 Wireless Router WPNT834

Advanced Configuration of the Router

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v1.0, November 2005

Setting the MTU Size

The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500 Bytes,

1492 Bytes for PPPoE connections, or 1436 for PPTP connections. For some ISPs you may need to

reduce the MTU. But this is rarely required, and should not be done unless you are sure it is

necessary for your ISP connection.

Any packets sent through the router that are larger than the configured MTU size are repackaged

into smaller packets to meet the MTU requirement. To change the MTU size:

1.

Under MTU Size, enter a new size between 64 and 1500.

2.

Click

Apply

to save the new configuration.

Using the LAN IP Setup Options

Another category under the Advanced heading is LAN IP Setup. This menu 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 8-9

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Reference Manual for the RangeMax 240 Wireless Router WPNT834

8-14

Advanced Configuration of the Router

v1.0, November 2005

Configuring LAN TCP/IP Setup Parameters

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 address—192.168.1.1

•

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 for 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 broadcasts its routing table periodically.

—

When set to Both or In Only, the router incorporates the RIP information that it receives.

—

When set to None, the router does not send any RIP packets and ignores 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 must then open a new connection to the

new IP address and log in again.

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Reference Manual for the RangeMax 240 Wireless Router WPNT834

Advanced Configuration of the Router

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v1.0, November 2005

Using the Router as a DHCP server

By default, the router functions 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. The

router assigns IP addresses to the attached computers 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.

For most applications, the default DHCP and TCP/IP settings of the router are satisfactory. See

“Wireless Communications” 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 may 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 menu;

otherwise, the router’s LAN IP address)

•

Secondary DNS Server (if you entered a Secondary DNS address in the Basic Settings menu)

To select 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 checked.

Using Address Reservation

When you specify a reserved IP address for a computer on the LAN, that computer will always

receive 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 the

Add

button.

2.

In the IP Address box, 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)

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Reference Manual for the RangeMax 240 Wireless Router WPNT834

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Advanced Configuration of the Router

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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.

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 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 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 will allow you to register your domain to their IP address, and will

forward traffic directed at your domain to your frequently-changing IP address.

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.

Tip:

If the computer is already present on your network, you can copy its MAC

address from the Attached Devices menu 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.

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