D-Link DIR-608 Router Manual PDF (Setup & Configuration Guide)

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D-Link DIR-608 User Manual

Section 5 - Troubleshooting

Troubleshooting

This chapter provides solutions to problems that can occur during the installation and operation of the DIR-608. 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 these examples.

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

When entering the IP address of the D-Link router (

192.168.11.1

for example), you are not connecting to a website, nor do

you 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 10 or higher

• EDGE Browser 20 or higher

• Firefox 28 or higher

• Safari 6.0 or higher

• Chrome 28 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 ﬁrewalls such as ZoneAlarm, BlackICE, Sygate,

Norton Personal Firewall, and Windows

®

XP ﬁrewall may block access to the conﬁguration pages. Check the help ﬁles included

with your ﬁrewall software for more information on disabling or conﬁguring it.

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Section 5 - Troubleshooting

• 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 D-Link router in the address bar. This

should open the login page for your web management.

• If you still 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. 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

192.168.11.1

. When logging in, leave the password box empty.

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D-Link DIR-608 User Manual

Section 5 - Troubleshooting

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).

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

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Section 5 - Troubleshooting

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 (192.168.11.1) 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.

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D-Link DIR-608 User Manual

Appendix A - Wireless Basics

D-Link 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 D-Link

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 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.

Wireless Basics

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