Linksys WRT51AB manual Appendix B How to Ping Your ISP’s E-mail & Web Addresses

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Instant Wireless® Series

Appendix B: How to Ping Your ISP’s E-mail & Web Addresses

Virtually all Internet addresses are configured with words or characters (e.g., www.linksys.com, www.yahoo.com, etc.) In actuality, however, these Internet addresses are assigned to IP addresses, which are the true addresses on the Internet. For example, www.yahoo.com is 66.218.71.87 (this IP address may change). Type it into your web browser and you will wind up at the Linksys home page every time. There are servers that translate the URL to an IP address; this is called the Domain Name System (DNS).

IP and web addresses, however, can sometimes be long and hard to remember. Because of this, certain ISPs will shorten their server addresses to single words or codes on their users’ web browser or e-mail configurations. If your ISP’s e- mail and web server addresses are configured with single words (www, e-mail, home, pop3, etc.) rather than whole Internet addresses or IP addresses, the Router may have problems sending or receiving mail and accessing the Internet. This happens because the Router has not been configured by your ISP to accept their abbreviated server addresses.

The solution is to determine the true web addresses behind your ISPs code words. You can determine the IP and web addresses of your ISP’s servers by “pinging” them.

Important: If you don’t have your ISP’s web and e-mail IP addresses, you must either get them from your ISP or follow these steps prior to connecting the Router to your network.

Dual-Band Wireless A+B Broadband Router

Step One: Pinging an IP Address

The first step to determining your ISP’s web and e-mail server address is to ping its IP address.

1.Power on the computer and the cable or DSL modem, and restore the net- work configuration set by your ISP if you have since changed it.

2.Click Start and then Run. Type command in the Open field. This will bring up the DOS window.

3.At the DOS command prompt, type ping mail (assuming that the location for which you’re trying to find an IP address is configured as mail). Press the Enter key. Information such as the following data, taken from a ping of Microsoft Network’s e-mail server, will be displayed.

C:\>ping mail

Pinging mail [24.53.32.4] with 32 bytes of data:

Reply from 24.53.32.4: bytes=32 time<10ms TTL=128

Reply from 24.53.32.4: bytes=32 time<10ms TTL=128

Reply from 24.53.32.4: bytes=32 time<10ms TTL=128

Reply from 24.53.32.4: bytes=32 time<10ms TTL=128

Ping statistics for 24.53.32.4:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms

Figure B-1

4.Write down the IP address returned by the ping command (in the example above: 24.53.32.4.). This IP address is the actual IP address of the server mail, or any other word or value you have pinged.

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Contents Dual-Band Wireless A+B Broadband Router Copyright & Trademarks Table of Contents Environmental 127 Common Problems and Solutions Frequently Asked QuestionsIntroduction What’s an IP Address? FeaturesRouter’s Functions IP AddressesDynamic IP Addresses Dhcp Dynamic Host Configuration Protocol ServersRouter Setup Overview Router’s Front Panel LEDs Getting to Know the Dual-Band Wireless A+B Broadband RouterRouter’s Back Panel Proceed to Connect the Router LAN IndicatorsInternet Indicators Overview Wired Connection to a PCConnect the Router Wireless Connection to a PC Configure the PCsGo to Configure the Router’s Basic Settings Configuring Windows 98 and Millennium PCsConfiguring Windows 2000 PCs Configuring Windows XP PCs Configure the Router’s Basic Settings Enter the Internet IP Address Automatic Configuration DhcpEnter the Default Gateway Static or Fixed IP AddressRouter’s Web-based Utility How to Access the Web-based UtilitySetup Automatic Configuration DhcpStatic IP Pptp 5GHz, 802.11a 5GHz, 802.11a WEP 4GHz, 802.11b WEP Status PasswordLAN Dhcp Help LogAdvanced Tabs 5GHz, 802.11a Advanced Wireless802.1x Configuration Radius Server Filters 11-20 , 21-30 , 31-40 , or 41-50 from Private MAC Filter To set up a filterPrivate IP Filter Port Forwarding Applications External Port TCP Protocol UDP ProtocolClick the Delete This Entry button RoutingDMZ Host MAC Address Clone For Windows NT Appendix a TroubleshootingCommon Problems and Solutions Need to set a static IP address on a PCFor Windows 98, Me, 2000, and XP For Windows XPWant to test my Internet connection TCP UDP Need to set up a server behind my RouterCan’t get the Internet game, server, or application to work My DSL service’s PPPoE is always disconnecting To start over, I need to set the Router to factory defaultNeed to upgrade the firmware Firmware upgrade failed, and/or the Diag LED is flashingClick the Advanced = Filters tab Frequently Asked QuestionsHow can I block corrupted FTP downloads? Does the Router support ICQ send file?What is the Ieee 802.11b standard? What is DMZ Hosting?What are the advanced features of the Router? What is the Ieee 802.11a standard?What is roaming? What Ieee 802.11b features are supported?What is ad-hoc mode? What is infrastructure mode?How do I resolve issues with signal loss? What is WEP?What is a MAC Address? How do I reset the Router?Step One Pinging an IP Address Appendix B How to Ping Your ISP’s E-mail & Web AddressesBackground Appendix C Configuring Wireless SecurityStep Two Pinging for a Web Address WEP Encryption 802.1x AuthenticationFigure C-2 MD5 Authentication for Windows XPFigure C-5 Figure C-9 Digital Certificate InstallationFigure C-13 Click Install this certificateFigure C-18 TLS Authentication for Windows XPFigure C-21 For Windows 95, 98, and Me Figure C-25For Windows NT, 2000, and XP Figure D-3Appendix E Glossary 111 113 115 117 119 121 123 125 Environmental Appendix F SpecificationsOne 10/100 RJ-45 Port for Cable/DSL Modem Category 5 Ethernet Network Cable or betterWeb site FTP site Appendix G Warranty InformationSales Information Technical Support RMA Issues Fax Appendix H Contact InformationCopyright 2002 Linksys, All Rights Reserved