D Link IR665A1 Xtreme N 450 Dual Band Gigabit Router User Manual UserMan 2 KA2IR665A1

D Link Corporation Xtreme N 450 Dual Band Gigabit Router UserMan 2 KA2IR665A1

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UserMan-2_KA2IR665A1

40D-Link DIR-665 User ManualSection 3 - ConﬁgurationSPI (Stateful Packet Inspection, also known as dynamic packet ﬁltering) helps to prevent cyber attacks by tracking more state per session. It validates that the trafﬁc passing through the session conforms to the protocol.Select one of the following for TCP and UDP ports:Endpoint Independent - Any incoming trafﬁc sent to an open port will be forwarded to the application that opened the port. The port will close if idle for 5 minutes.Address Restricted - Incoming trafﬁc must match the IP address of the outgoing connection.Address + Port Restriction - Incoming trafﬁc must match the IP address and port of the outgoing connection.If an application has trouble working from behind the router, you can expose one computer to the Internet and run the application on that computer.Note: Placing a computer in the DMZ may expose that computer to a variety of security risks. Use of this option is only recommended as a last resort.Specify the IP address of the computer on the LAN that you want to have unrestricted Internet communication. If this computer obtains it’s IP address automatically using DHCP, be sure to make a static reservation on the Basic > DHCP page so that the IP address of the DMZ machine does not change.Enable SPI:NAT Endpoint Filtering:Enable DMZ Host:IP Address:Firewall SettingsA ﬁrewall protects your network from the outside world. The D-Link DIR-665 offers a ﬁrewall type functionality. The SPI feature helps prevent cyber attacks. Sometimes you may want a computer exposed to the outside world for certain types of applications. If you choose to expose a computer, you cam enable DMZ. DMZ is short for Demilitarized Zone. This option will expose the chosen computer completely to the outside world.

41D-Link DIR-665 User ManualSection 3 - ConﬁgurationApplication Level Gateway (ALG) ConﬁgurationHere you can enable or disable ALG’s. Some protocols and applications require special handling of the IP payload to make them work with network address translation (NAT). Each ALG provides special handling for a speciﬁc protocol or application. A number of ALGs for common applications are enabled by default.Allows multiple machines on the LAN to connect to their corporate network using PPTP protocol. Allows multiple VPN clients to connect to their corporate network using IPSec. Some VPN clients support traversal of IPSec through NAT. This ALG may interfere with the operation of such VPN clients. If you are having trouble connecting with your corporate network, try turning this ALG off. Please check with the system adminstrator of your corporate network whether your VPN client supports NAT traversal.Allows applications that use Real Time Streaming Protocol to receive streaming media from the internet. QuickTime and Real Player are some of the common applications using this protocol. Allows devices and applications using VoIP (Voice over IP) to communicate across NAT. Some VoIP applications and devices have the ability to discover NAT devices and work around them. This ALG may interfere with the operation of such devices. If you are having trouble making VoIP calls, try turning this ALG off. PPTP:IPSEC (VPN):RTSP:SIP:

42D-Link DIR-665 User ManualSection 3 - ConﬁgurationRoutingEnter the IP address of packets that will take this route.Enter the netmask of the route, please note that the octets must match your destination IP address.Enter your next hop gateway to be taken if this route is used.The route metric is a value from 1 to 16 that indicates the cost of using this route. A value 1 is the lowest cost and 15 is the highest cost. Select the interface that the IP packet must use to transit out of the router when this route is used. Destination IP:Netmask:Gateway:Metric:Interface:The Routing option is an advanced method of customizing speciﬁc routes of data through your network.

43D-Link DIR-665 User ManualSection 3 - ConﬁgurationTransmit Power ModeSet the transmit power of the antennas.Beacons are packets sent by an Access Point to synchronize a wireless network. Specify a value. 100 is the default setting and is recommended. This value should remain at its default setting of 2432. If inconsistent data ﬂow is a problem, only a minor modiﬁcation should be made.(Delivery Trafﬁc Indication Message) 3 is the default setting. A DTIM is a countdown informing clients of the next window for listening to broadcast and multicast messages.WMM is QoS for your wireless network. This will improve the quality of video and voice applications for your wireless clients.Check box if you wish to enable this feature.Check this box to reduce the guard interval time therefore increasing the data capacity. However, it’s less reliable and may create higher data loss.Transmit Power:Beacon Period:RTS Threshold:DTIM Interval:WMM Function:WMM Enable:Short GI:Advanced Wireless Settings

44D-Link DIR-665 User ManualSection 3 - ConﬁgurationUPnPInternet Ping BlockInternet Port SpeedMulticast StreamsTo use the Universal Plug and Play (UPnP™) feature click on Enabled. UPNP provides compatibility with networking equipment, software and peripherals.Unchecking the box will not allow the DIR-665 to respond to pings. Blocking the Ping may provide some extra security from hackers. Check the box to allow the Internet port to be “pinged”.You may set the port speed of the Internet port to 10Mbps, 100Mbps, or auto. Some older cable or DSL modems may require you to set the port speed to 10Mbps.Check the box to allow multicast trafﬁc to pass through the router from the Internet.UPnP Settings:Internet Ping:Internet Port Speed:Multicast streams:Advanced Network Settings

45D-Link DIR-665 User ManualSection 3 - ConﬁgurationChange PasswordRemote ManagementEnter a new password for the Administrator Login Name. The administrator can make changes to the settings.Enter the new password for the User login. If you login as the User, you can only see the settings, but cannot change them.Enter a name for the DIR-665 router.Enables a challenge-response test to require users to type letters or numbers from a distorted image displayed on the screen to prevent online hackers and unauthorized users from gaining access to your router’s network settings. Remote management allows the DIR-665 to be conﬁgured from the Internet by a web browser. A username and password is still required to access the Web-Management interface. In general, only a member of your network can browse the built-in web pages to perform Administrator tasks. This feature enables you to perform Administrator tasks from the remote (Internet) host.The port number used to access the DIR-665.Example: http://x.x.x.x:8080 whereas x.x.x.x is the Internet IP address of the DIR-665 and 8080 is the port used for the Web Management interface.This section will list any rules that are created. You may click the Edit icon to change the settings or enable/disable the rule, or click the Delete icon to remove the rule.Admin Password:User Password:Gateway Name:Enable Graphical Authentication:Enable Remote Management:Remote Admin Port:Inbound Filter:Administrator SettingsThis page will allow you to change the Administrator and User passwords. You can also enable Remote Management. There are two accounts that can access the management interface through the web browser. The accounts are admin and user. Admin has read/write access while user has read-only access. User can only view the settings but cannot make any changes. Only the admin account has the ability to change both admin and user account passwords.

46D-Link DIR-665 User ManualSection 3 - ConﬁgurationTime SettingsSelect the Time Zone from the drop-down menu.To select Daylight Saving time manually, select enabled or disabled, and enter a start date and an end date for daylight saving time.NTP is short for Network Time Protocol. NTP synchronizes computer clock times in a network of computers. Check this box to use a NTP server. This will only connect to a server on the Internet, not a local server.Enter the NTP server or select one from the drop-down menu.To manually input the time, enter the values in these ﬁelds for the Year, Month, Day, Hour, Minute, and Second and then click Set Time. You can also click Copy Your Computer’s Time Settings.Time Zone:Daylight Saving:Enable NTP Server:NTP Server Used:Manual:The Time Conﬁguration option allows you to conﬁgure, update, and maintain the correct time on the internal system clock. From this section you can set the time zone that you are in and set the Time Server. Daylight Saving can also be conﬁgured to automatically adjust the time when needed.

47D-Link DIR-665 User ManualSection 3 - ConﬁgurationSysLogThe Broadband Router keeps a running log of events and activities occurring on the Router. You may send these logs to a SysLog server on your network.Enable Logging to SysLog Server:SysLog Server IP Address:Check this box to send the router logs to a SysLog Server.The address of the SysLog server that will be used to send the logs. You may also select your computer from the drop-down menu (only if receiving an IP address from the router via DHCP).

48D-Link DIR-665 User ManualSection 3 - ConﬁgurationEmail SettingsThe Email feature can be used to send the system log ﬁles, router alert messages, and ﬁrmware update notiﬁcation to your email address. Enable Email Notiﬁcation: From Email Address:To Email Address:SMTP Server Address:Enable Authentication:Account Name:Password:On Log Full:On Schedule:Schedule:When this option is enabled, router activity logs are e-mailed to a designated email address.This email address will appear as the sender when you receive a log ﬁle or ﬁrmware upgrade notiﬁcation via email.Enter the email address where you want the email sent. Enter the SMTP server address for sending email. If your SMTP server requires authentication, select this option.Check this box if your SMTP server requires authentication. Enter your account for sending email.Enter the password associated with the account. Re-type the password associated with the account.When this option is selected, logs will be sent via email when the log is full.Selecting this option will send the logs via email according to schedule.This option is enabled when On Schedule is selected. You can select a schedule from the list of deﬁned schedules. To create a schedule, go to Tools > Schedules.

49D-Link DIR-665 User ManualSection 3 - ConﬁgurationUse this option to save the current router conﬁguration settings to a ﬁle on the hard disk of the computer you are using. First, click the Save button. You will then see a ﬁle dialog, where you can select a location and ﬁle name for the settings. Use this option to load previously saved router configuration settings. First, use the Browse control to ﬁnd a previously save ﬁle of conﬁguration settings. Then, click the Load button to transfer those settings to the router. This option will restore all conﬁguration settings back to the settings that were in effect at the time the router was shipped from the factory. Any settings that have not been saved will be lost, including any rules that you have created. If you want to save the current router conﬁguration settings, use the Save button above. Click to reboot the router.Save Settings to Local Hard Drive:Load Settings from Local Hard Drive:Restore to Factory Default Settings:Reboot Device:System Settings

50D-Link DIR-665 User ManualSection 3 - ConﬁgurationClick on Check Online Now for Latest Firmware Version to ﬁnd out if there is an updated ﬁrmware; if so, download the new ﬁrmware to your hard drive.After you have downloaded the new ﬁrmware, click Browse to locate the ﬁrmware update on your hard drive. Click Upload to complete the ﬁrmware upgrade.Check Automatically Check Online for Latest Firmware Version to have the router check automatically to see if there is a new ﬁrmware upgrade.Check Email Notiﬁcation of Newer Firmware Version to have the router send an email when there is a new ﬁrmware available.Firmware Upgrade:Browse:Notiﬁcations Options:Update FirmwareYou can upgrade the ﬁrmware of the Router here. Make sure the ﬁrmware you want to use is on the local hard drive of the computer. Click on Browse to locate the ﬁrmware ﬁle to be used for the update. Please check the D-Link support site for ﬁrmware updates at http://support.dlink.com. You can download ﬁrmware upgrades to your hard drive from the D-Link support site.

51D-Link DIR-665 User ManualSection 3 - ConﬁgurationDynamic Domain Name System is a method of keeping a domain name linked to a changing IP Address. Check the box to enable DDNS.Choose your DDNS provider from the drop down menu.Enter the Host Name that you registered with your DDNS service provider.Enter the Username for your DDNS account.Enter the Password for your DDNS account.Enter a time (in hours).DDNS:Server Address:Host Name:Username or Key:Password or Key:Timeout:DDNSThe DDNS feature allows you to host a server (Web, FTP, Game Server, etc…) using a domain name that you have purchased (www.whateveryournameis.com) with your dynamically assigned IP address. Most broadband Internet Service Providers assign dynamic (changing) IP addresses. Using a DDNS service provider, your friends can enter in your domain name to connect to your server no matter what your IP address is.

52D-Link DIR-665 User ManualSection 3 - ConﬁgurationThe Ping Test is used to send Ping packets to test if a computer is on the Internet. Enter the IP Address that you wish to Ping, and click Ping.The results of your ping attempts will be displayed here.System CheckPing Test:Ping Results:

53D-Link DIR-665 User ManualSection 3 - ConﬁgurationEnter a name for your new schedule.Select a day, a range of days, or All Week to include every day.Check All Day - 24hrs or enter a start and end time for your schedule.Click Save to save your schedule. You must click Save Settings at the top for your schedules to go into effect.The list of schedules will be listed here. Click the Edit icon to make changes or click the Delete icon to remove the schedule.Name:Days:Time:Save:Schedule Rules List:Schedules

54D-Link DIR-665 User ManualSection 3 - ConﬁgurationThis page displays the current information for the DIR-665. It will display the LAN, WAN (Internet), and Wireless information.If your Internet connection is set up for a Dynamic IP address then a Release button and a Renew button will be displayed. Use Release to disconnect from your ISP and use Renew to connect to your ISP. If your Internet connection is set up for PPPoE, a Connect button and a Disconnect button will be displayed. Use Disconnect to drop the PPPoE connection and use Connect to establish the PPPoE connection.Displays the router’s time and ﬁrmware version.Displays the MAC address and the public IP settings for the router.Displays the MAC address and the private (local) IP settings for the router.Displays the wireless MAC address and your wireless settings such as SSID and Channel.Displays computers and devices that are connected to the router via Ethernet and that are receiving an IP address assigned by the router (DHCP). Displays the Multicast Group IP Address.General:WAN:LAN:Wireless LAN:LAN Computers:IGMP Multicast Memberships:Device Information

55D-Link DIR-665 User ManualSection 3 - ConﬁgurationLogWhat to View:View Levels:Apply Log Settings:Refresh:Clear:Email Now:Save Log:You can select the types of messages that you want to display from the log. Firewall & Security, System, and Router Status messages can be selected.There are three levels of message importance: Informational, Warning, and Critical. Select the levels that you want displayed in the log.Will ﬁlter the log results so that only the selected options appear.Updates the log details on the screen so it displays any recent activity.Clears all of the log contents.This option will send a copy of the router log to the email address conﬁgured in the Tools > Email screen.This option will save the router to a log ﬁle on your computer.The router automatically logs (records) events of possible interest in it’s internal memory. If there isn’t enough internal memory for all events, logs of older events are deleted but logs of the latest events are retained. The Logs option allows you to view the router logs. You can deﬁne what types of events you want to view and the level of the events to view. This router also has external Syslog Server support so you can send the log ﬁles to a computer on your network that is running a Syslog utility.

56D-Link DIR-665 User ManualSection 3 - ConﬁgurationStatisticsThe screen below displays the Trafﬁc Statistics. Here you can view the amount of packets that pass through the DIR-665 on both the Internet and the LAN ports. The trafﬁc counter will reset if the device is rebooted.Internet SessionsThis screen displays details of the active internet sessions connected to your router.

57D-Link DIR-665 User ManualSection 3 - ConﬁgurationThe wireless client table displays a list of current connected wireless clients. This table also displays the connection time and MAC address of the connected wireless clients.WirelessRoutingThis screen displays the routing details conﬁgured from your router.

58D-Link DIR-665 User ManualSection 3 - ConﬁgurationSupport

59D-Link DIR-665 User ManualSection 4 - SecurityWireless SecurityThis section will show you the different levels of security you can use to protect your data from intruders. The DIR-665 offers the following types of security:• WPA2 (Wi-Fi Protected Access 2) • WPA2-PSK (Pre-Shared Key)• WPA (Wi-Fi Protected Access) • WPA-PSK (Pre-Shared Key)What is WPA?WPA, or Wi-Fi Protected Access, is a Wi-Fi standard that was designed to improve the security features of WEP (Wired Equivalent Privacy). The 2 major improvements over WEP: • Improved data encryption through the Temporal Key Integrity Protocol (TKIP). TKIP scrambles the keys using a hashing algorithm and, by adding an integrity-checking feature, ensures that the keys haven’t been tampered with. WPA2 is based on 802.11i and uses Advanced Encryption Standard (AES) instead of TKIP.• User authentication, which is generally missing in WEP, through the extensible authentication protocol (EAP). WEP regulates access to a wireless network based on a computer’s hardware-speciﬁc MAC address, which is relatively simple to be sniffed out and stolen. EAP is built on a more secure public-key encryption system to ensure that only authorized network users can access the network.WPA-PSK/WPA2-PSK uses a passphrase or key to authenticate your wireless connection. The key is an alpha-numeric password between 8 and 63 characters long. The password can include symbols (!?*&_) and spaces. This key must be the exact same key entered on your wireless router or access point.WPA/WPA2 incorporates user authentication through the Extensible Authentication Protocol (EAP). EAP is built on a more secure public key encryption system to ensure that only authorized network users can access the network.

60D-Link DIR-665 User ManualSection 4 - SecurityWireless Security Setup WizardTo run the security wizard, click on Setup at the top and then click Launch Wireless Security Setup Wizard.Enter the SSID (Service Set Identiﬁer) name for your network. You may also create a name using up to 32 characters. The SSID is also case sensitive. Select from the following choices: • Automatically assign a network key • Manually assign a network key Click Next to continue.The Setup is now complete. Keep the information provided for future reference. Click Save to ﬁnish.

61D-Link DIR-665 User ManualSection 4 - SecurityEnter the SSID (Service Set Identiﬁer). The SSID is the name of your wireless network. Create a name using up to 32 characters. The SSID is case-sensitive. If you selected to Manually assign a network key, click Next to continue. Select a wireless security password between 8 and 63 characters. Click Next to continue.Your setup is now complete. Print the information provided or write on a piece of paper to conﬁgure the correct settings. Click Save to ﬁnish.

62D-Link DIR-665 User ManualSection 4 - SecurityIf you selected Better, the following screen will show you your Pre-Shared Key to enter on your wireless clients. Click Save to ﬁnish the Security Wizard.If you selected Best, the following screen will show you your Pre-Shared Key to enter on your wireless clients. Click Save to ﬁnish the Security Wizard.If you selected WPA-Enterprise, the RADIUS information will be displayed. Click Save to ﬁnish the Security Wizard.

63D-Link DIR-665 User ManualSection 4 - SecurityWireless Device with WPS WizardFrom the Setup > Wireless Settings screen, click Add Wireless Device with WPS.PIN: Select this option to use PIN method. In order to use this method you must know the wireless client’s 8 digit PIN and click Connect.PBC: Select this option to use PBC (Push Button) method to add a wireless client. Click Connect.Select Auto to add a wireless client using WPS (Wi-Fi Protected Setup). Once you select Auto and click Connect, you will have a 120 second time limit to apply the settings to your wireless client(s) and successfully establish a connection. If you select Manual, a settings summary screen will appear. Write down the security key and enter this on your wireless clients.

64D-Link DIR-665 User ManualSection 4 - SecurityConﬁgure WPA-Personal (PSK)It is recommended to enable encryption on your wireless router before your wireless network adapters. Please establish wireless connectivity before enabling encryption. Your wireless signal may degrade when enabling encryption due to the added overhead.1. Log into the web-based conﬁguration by opening a web browser and entering the IP address of the router (192.168.0.1). Click on Setup and then click Wireless Settings on the left side.2. Next to Security Mode, select WPA-Personal.3. Next to WPA Mode, select Auto, WPA2 Only, or WPA Only. Use Auto if you have wireless clients using both WPA and WPA2.4. Next to Group Key Update Interval, enter the amount of time before the group key used for broadcast and multicast data is changed (3600 is default).5. Next to Pre-Shared Key, enter a key (passphrase). The key is entered as a pass-phrase in ASCII format at both ends of the wireless connection. The pass-phrase must be between 8-63 characters. 6. Click Save Settings to save your settings. If you are conﬁguring the router with a wireless adapter, you will lose connectivity until you enable WPA-PSK on your adapter and enter the same passphrase as you did on the router.

65D-Link DIR-665 User ManualSection 4 - SecurityIt is recommended to enable encryption on your wireless router before your wireless network adapters. Please establish wireless connectivity before enabling encryption. Your wireless signal may degrade when enabling encryption due to the added overhead.1. Log into the web-based conﬁguration by opening a web browser and entering the IP address of the router (192.168.0.1). Click on Setup and then click Wireless Settings on the left side.2. Next to Security Mode, select WPA-Enterprise.3. Next to WPA Mode, select Auto, WPA2 Only, or WPA Only. Use Auto if you have wireless clients using both WPA and WPA2.4. Next to Group Key Update Interval, enter the amount of time before the group key used for broadcast and multicast data is changed (3600 is default).5. Next to Authentication Timeout, enter the amount of time before a client is required to re-authenticate (60 minutes is default). 6. Next to RADIUS Server IP Address enter the IP Address of your RADIUS server.7. Next to RADIUS Server Port, enter the port you are using with your RADIUS server. 1812 is the default port.8. Next to RADIUS Server Shared Secret, enter the security key.Conﬁgure WPA-Enterprise (RADIUS)

66D-Link DIR-665 User ManualSection 4 - Security9. If the MAC Address Authentication box is selected then the user will need to connect from the same computer whenever logging into the wireless network.10. Click Advanced to enter settings for a secondary RADIUS Server.11. Click Apply Settings to save your settings.

67D-Link DIR-665 User ManualSection 5 - Connecting to a Wireless NetworkConnect to a Wireless NetworkUsing Windows® Vista™Windows® Vista™ users may use the built-in wireless utility. If you are using another company’s utility or Windows® 2000, please refer to the user manual of your wireless adapter for help with connecting to a wireless network. Most utilities will have a “site survey” option similar to the Windows® Vista™ utility as seen below.Right-click on the wireless computer icon in your system tray (lower-right corner next to the time). Select Connect to a network.If you receive the Wireless Networks Detected bubble, click on the center of the bubble to access the utility. orThe utility will display any available wireless networks in your area. Click on a network (displayed using the SSID) and click the Connect button.If you get a good signal but cannot access the Internet, check you TCP/IP settings for your wireless adapter. Refer to the Networking Basics section in this manual for more information.

68D-Link DIR-665 User ManualSection 5 - Connecting to a Wireless NetworkConﬁgure Wireless SecurityIt is recommended to enable wireless security (WPA/WPA2) on your wireless router or access point before conﬁguring your wireless adapter. If you are joining an existing network, you will need to know the security key or passphrase being used.2. Highlight the wireless network (SSID) you would like to connect to and click Connect.1. Open the Windows® Vista™ Wireless Utility by right-clicking on the wireless computer icon in your system tray (lower right corner of screen). Select Connect to a network.

69D-Link DIR-665 User ManualSection 5 - Connecting to a Wireless Network3. Enter the same security key or passphrase that is on your router and click Connect.It may take 20-30 seconds to connect to the wireless network. If the connection fails, please verify that the security settings are correct. The key or passphrase must be exactly the same as on the wireless router.

70D-Link DIR-665 User ManualSection 5 - Connecting to a Wireless NetworkConnect to a Wireless NetworkUsing Windows® XPWindows® XP users may use the built-in wireless utility (Zero Conﬁguration Utility). The following instructions are for Service Pack 2 users. If you are using another company’s utility or Windows® 2000, please refer to the user manual of your wireless adapter for help with connecting to a wireless network. Most utilities will have a “site survey” option similar to the Windows® XP utility as seen below.Right-click on the wireless computer icon in your system tray (lower right corner next to the time). Select View Available Wireless Networks.If you receive the Wireless Networks Detected bubble, click on the center of the bubble to access the utility. orThe utility will display any available wireless networks in your area. Click on a network (displayed using the SSID) and click the Connect button.If you get a good signal but cannot access the Internet, check you TCP/IP settings for your wireless adapter. Refer to the Networking Basics section in this manual for more information.

71D-Link DIR-665 User ManualSection 5 - Connecting to a Wireless NetworkConﬁgure WPA-PSKIt is recommended to enable encryption on your wireless router or access point before conﬁguring your wireless adapter. If you are joining an existing network, you will need to know the passphrase being used.2. Highlight the wireless network (SSID) you would like to connect to and click Connect.1. Open the Windows® XP Wireless Utility by right-clicking on the wireless computer icon in your system tray (lower-right corner of screen). Select View Available Wireless Networks.

72D-Link DIR-665 User ManualSection 5 - Connecting to a Wireless Network3. The Wireless Network Connection box will appear. Enter the WPA-PSK passphrase and click Connect.It may take 20-30 seconds to connect to the wireless network. If the connection fails, please verify that the WPA-PSK settings are correct. The WPA-PSK passphrase must be exactly the same as on the wireless router.

73D-Link DIR-665 User ManualSection 6 - TroubleshootingTroubleshootingThis chapter provides solutions to problems that can occur during the installation and operation of the DIR-665. 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 D-Link 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 • Netscape 8 or higher • Mozilla 1.7.12 (5.0) or higher • Opera 8.5 or higher • Safari 1.2 or higher (with Java 1.3.1 or higher) • Camino 0.8.4 or higher • Firefox 1.5 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 Zone Alarm, Black Ice, 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.

74D-Link DIR-665 User ManualSection 6 - 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 the 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. 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.

75D-Link DIR-665 User ManualSection 6 - Troubleshooting3. 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 and Vista™ 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

76D-Link DIR-665 User ManualSection 6 - 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 (192.168.0.1) 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.

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