Rosewill T900N-X User Manual

Troubleshooting

This chapter provides solutions to problems that can occur during the installation and operation of the WRTB-283N. Read the following

descriptions

if you are having problems. (The examples below are illustrated in Windows® XP. If you have a different operating system, the screenshots on your

computer will look similar to the following examples.)

1. Why can’t I access the web-based configuration utility?

When entering the IP address of the Gemtek router (192.168.0.1 for example), you are not connecting to a website on the Internet or have to be
connected to the Internet. The device has the utility built-in to a ROM chip in the device itself. Your computer must be on the same IP subnet to

connect to the web-based utility.

• Make sure you have an updated Java-enabled web browser. We recommend the following:

• Internet Explorer 6.0 or higher

• Chrome 2.0 or higher

• Safari 3.0 or higher

• Firefox 3.0 or higher

• Verify physical connectivity by checking for solid link lights on the device. If you do not get a solid link light, try using a different cable or

connect

to a different port on the device if possible. If the computer is turned off, the link light may not be on.

• Disable any internet security software running on the computer. Software firewal s such as Zone Alarm, Black Ice, Sygate, Norton
Personal Firewal ,

and Windows XP firewal may block access to the configuration pages. Check the help files included with your firewal software for more
information

on disabling or configuring it.

• Configure your Internet settings:

• Go to Start > Settings > Control Panel. Double-click the Internet Options Icon. From the Security tab, click the button to restore
the settings to their defaults.

• Click the Connection tab and set the dial-up option to Never Dial a Connection. Click the LAN Settings button. Make sure

nothing

is checked. Click OK.

• Go to the Advanced tab and click the button to restore these settings to their defaults. Click OK three times.

• Close your web browser (if open) and open it.

• Access the web management. Open your web browser and enter the IP address of your Gemtek router in the address bar. This
should open the

login page for your the web management.

• If you stil cannot access the configuration, unplug the power to the router for 10 seconds and plug back in. Wait about 30 seconds
and try accessing

the configuration. If you have multiple computers, try connecting using a different computer.

2. What can I do if I forgot my password?

If you forgot your password, you must reset your router. Unfortunately this process will change all your settings back to the factory

defaults.

To reset the router, locate the reset button (hole) on the rear panel of the unit. With the router powered on, use a paperclip to hold the button
down for 10 seconds. Release the button and the router will go through its reboot process. Wait about 30 seconds to access the router. The default

IP address is 192.168.0.1. When logging in, the username is admin and leave the password box empty.

3. Why can’t I connect to certain sites or send and receive emails when connecting through my router?

If you are having a problem sending or receiving email, or connecting to secure sites such as eBay, banking sites, and Hotmail, we
suggest lowering

the MTU in increments of ten (Ex. 1492, 1482, 1472, etc).

Note: AOL DSL+ users must use MTU of 1400.

To find the proper MTU Size, you’ll have to do a special ping of the destination you’re trying to go to. A destination could be another computer, or

a URL.

• Click on Start and then click Run.

• Windows® 95, 98, and Me users type in command (Windows NT, 2000, XP, Vista® and 7 users type in cmd) and press Enter (or

click

OK).

• Once the window opens, you’ll need to do a special ping. Use the following syntax:

ping [url] [-f] [-l] [MTU value]

Example: ping yahoo.com -f -l 1472

You should start at 1472 and work your way down by 10 each time. Once you get a reply, go up by 2 until you get a fragmented

packet. Take that

value and add 28 to the value to account for the various TCP/IP headers. For example, lets say that 1452 was the proper value, the actual MTU size

would be 1480, which is the optimum for the network we’re working with (1452+28=1480).

Once you find your MTU, you can now configure your router with the proper MTU size.

To change the MTU rate on your router follow the steps below:

• Open your browser, enter the IP address of your router (192.168.0.1) and click OK.

• Enter your username (admin) and password (blank by default). Click OK to enter the web configuration page for the device.

• Click on Setup and then click Manual Configure.

• To change the MTU enter the number in the MTU field and click Save Settings to save your settings.

• Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.

Wireless Basics

Gemtek wireless products are based on industry standards to provide easy-to-use and compatible high-speed wireless connectivity

within your

home, business or public access wireless networks. Strictly adhering to the IEEE standard, the Gemtek wireless family of products will allow you to

securely access the data you want, when and where you want it. You will be able to enjoy the freedom that wireless networking delivers.

A wireless local area network (WLAN) is a cellular computer network that transmits and receives data with radio signals instead of wires. Wireless
LANs are used increasingly in both home and office environments, and public areas such as airports, coffee shops and universities. Innovative ways
to utilize WLAN technology are helping people to work and communicate more efficiently. Increased mobility and the absence of cabling and other

fixed infrastructure have proven to be beneficial for many users.

Wireless users can use the same applications they use on a wired network. Wireless adapter cards used on laptop and desktop systems support the

same protocols as Ethernet adapter cards.

Under many circumstances, it may be desirable for mobile network devices to link to a conventional Ethernet LAN in order to use servers, printers

or an Internet connection supplied through the wired LAN. A Wireless Router is a device used to provide this link.

What is Wireless?

Wireless or Wi-Fi technology is another way of connecting your computer to the network without using wires. Wi-Fi uses radio frequency to

connect

wirelessly, so you have the freedom to connect computers anywhere in your home or office network.

Why Gemtek Wireless?

Gemtek is the worldwide leader and award winning designer, developer, and manufacturer of networking products. Gemtek delivers the
performance

you need at a price you can afford. Gemtek has all the products you need to build your network.