Linksys BEFSR81v2 Router Manual PDF (Setup & Configuration Guide)

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Step Two: Pinging for a Web Address

While the IP address returned above would work as your e-mail server address,

it may not be permanent. IP addresses change all the time. Web addresses, how-

ever, usually don’t. Because of this, you’re likely to have fewer problems by

configuring your system with web addresses rather than IP addresses. Follow

the instructions below to find the web address assigned to the IP address you

just pinged.

At the DOS command prompt

, type

ping -a 24.53.32.4

, where 24.53.32.4

is the IP address you just pinged. Information such as the following data

will be displayed.

C:\>ping -a 24.53.32.4

Pinging mail.msnv3.occa.home.com [24.53.32.4] with

32 bytes of data:

Reply from 24.53.32.4: bytes=32 time<10ms TTL=127

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

Write down the web address returned by the ping command

(In the

example in Figure C-2:

mail.msnv3.occa.home.com

is the web address).

This web address is the web address assigned to the IP address you just

pinged. While the IP address of

mail

could conceivably change, it is likely

that this web address will not.

Replace your ISP’s abbreviated server address

with this extended web

address in the corresponding Internet application (web browser, e-mail

application, etc.).

Once you have replaced the brief server address with the true server address,

the Router should have no problem accessing the Internet through that Internet

application.

Figure C-2

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.

Power on the computer and the cable or DSL modem

, and restore the

network configuration set by your ISP if you have since changed it.

Click Start

, then

Run,

and type

command

in the Open field. This will

bring up the DOS window.

At the DOS command prompt

, type

ping mail

(assuming that the loca-

tion for which you’re trying to find an IP address is configured as

mail

Press

Enter

. 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

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

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.

Figure C-1

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Appendix D: Installing the

TCP/IP Protocol

Follow these instructions to install the TCP/IP protocol on one of your PCs

only

after a network card (also called an Ethernet adapter) has been successfully

installed inside the PC. These instructions are for Windows 95, 98, and

Me.

For TCP/IP setup under Windows NT, 2000, and XP, see your Windows docu-

mentation or the Help feature.

1. Click the

Start

button. Choose

Settings

and then

Control Panel

2. Double-click on the

Network

icon to bring up your Network window.

Select the

Configuration

tab, as shown in Figure D-1.

3. Click the

Add

button

4. Double-click on

Protocol

5. Highlight

Microsoft

under the list of manufacturers.

6. Find and double-click

TCP/IP

in the list to the right (see Figure D-2).

After a few seconds, the main Network window will appear.

The TCP/IP

Protocol should now be listed on the Configuration tab, as shown in Figure

D-3.

8. Click the

button. Windows may ask for original Windows installation

files. Supply them as needed, e.g., c:\windows\options\cabs, D:\win98,

D:\win95 (where “D” is the letter of your CD-ROM drive).

Windows will ask you to restart the PC. Click the

Yes

button.

TCP/IP installation is now complete.

Figure D-2

Figure D-3

Figure D-1

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Appendix E: Twisted-Pair

Cabling

There are different grades, or “categories,” of twisted-pair cabling. Category 5

is the most reliable and most highly recommended. Straight-through cables are

used for connecting computers to a hub. Crossover cables are used for con-

necting a hub to another hub (there is an exception: some hubs have a built-in

uplink port that is crossed internally; this allows you to link or connect hubs

together with a straight-through cable instead).

You can buy pre-made Category 5

cables, or cut and crimp your own.

Category 5 cables can be purchased or

crimped as either straight-through or

crossover. Inside a Category 5 cable

are eight thin, color-coded wires

inside that run from one end of the

cable to the other. All eight wires are

used. In a straight-through cable,

wires 1, 2, 3, and 6 at one end of the

cable are also wires 1, 2, 3, and 6 at

the other end. In a crossover cable, the

order of the wires change from one

end to the other: wire 1 becomes 3,

and 2 becomes 6. See Figures E-3 and

E-4 on the next page for

more detailed informa-

tion on straight-through

and crossover cabling.

To determine which wire is wire number 1, hold the cable

so that the end of the plastic RJ-45 tip (the part that goes

into a wall jack first) is facing away from you. Face the

clip down so that the copper side faces up (the springy clip

will now be parallel to the floor).

When looking down on

the copper side, wire 1 will be on the far left.

Crimping Your Own Network Cables

•

Straight-Through Cabling

•

Cross-Over Cabling

Figure E-3

Figure E-4

Figure E-1

Figure E-2

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3. Write

down

the

Adapter Address as

shown on your com-

puter

screen

(see

Figure F-3).

This is

the MAC address for

your Ethernet adapter

and will be shown as

a series of numbers

and letters.

The MAC address/Adapter Address is what you will use for the Router’s

MAC Address Cloning or MAC Filtering.

The example in Figure F-3 shows the IP address of your Ethernet adapter

as 192.168.1.100. Your computer may show something different.

For Windows NT, 2000, and XP:

1. Click on

Start

and

choose

Run

. In the

Open

field,

enter

cmd

, as shown in

Figure F-4. Press the

Enter

key or click

the

button.

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Appendix F: Finding the MAC

Address and IP Address for Your

Ethernet Adapter

This appendix describes how to find the MAC address for your Ethernet

adapter to do either MAC Filtering or MAC Address Cloning.

You can also

find the IP address of your computer’s Ethernet adapter.

The IP address is used

for filtering, forwarding, and DMZ hosting.

Find your Windows operating sys-

tem and follow the steps in this appendix to find the MAC address or IP address

for your adapter.

For Windows 95, 98, and Me:

1. Click

Start

and

choose

Run

. In the Open

field, type

winipcfg

, as

shown in Figure F-1.

Then, press the

Enter

key or click the

but-

ton.

2. When

the

Configuration

o w

appears, select

the

Ethernet

adapter that you

are

using,

shown in Figure

F-2.

Figure F-3

Figure F-4

Note

: The MAC address is also called the Adapter

Address in Windows 95, 98, and Me.

Figure F-1

Figure F-2

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Enter the

12-digit MAC address

that you wrote down from the

Physical Address shown in Figure

F-5.

Make sure to type the 12 dig-

its

without the hyphens

into one

of the fields for MAC Filtering.

(See Figure F-6.)

Click on

Apply

when finished.

When entering information for MAC Address Cloning, type the

12-digit MAC

address

(see Figure F-7).

Click on

Apply

when finished.

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2. In the command prompt, enter

ipconfig /all

press the

Enter

key.

Your PC’s

information will be displayed as shown in Figure F-5.

3. Write down the Physical Address as shown on your computer screen; it is

the MAC address for your Ethernet adapter.

It will appear as a series of let-

ters and numbers.

The MAC address/Physical Address is what you will use for MAC Address

Cloning or MAC Filtering.

The example in Figure F-5 shows the IP address of your Ethernet adapter

as 192.168.1.100. Your computer may show something different.

Figure F-6

Figure F-7

Figure F-5

Note

: The MAC address is also called the Physical

Address in Windows NT, 2000, and XP.

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