Linksys BEFSR81v3 Router Manual PDF (Setup & Configuration Guide)

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EtherFast

®

Cable/DSL Router with QoS and 8-Port Switch

Number of DHCP Users

(Optional) Enter the maximum number of PCs that

you want the DHCP server to assign IP addresses to. This number cannot be

greater than 253.

In order to determine the DHCP IP Address range, add the

last three digits of the starting IP address (e.g., 100) to the number of DHCP

users.

By default, as shown in Figure 6-11, add 100 to 50 (number of DHCP

users), and the range is 192.168.1.100 to 192.168.1.149.

Client Lease Time

The Client Lease Time is the amount of time a network

user will be allowed connection to the Router with their current dynamic IP

address. Enter the amount of time, in minutes, that the user will be “leased” this

dynamic IP address.

DNS

The Domain Name System (DNS) is how the Internet translates domain

or website names into Internet addresses or URLs. Your ISP will provide you

with at least one DNS Server IP Address. If you wish to use another, type that

IP Address in one of these fields. You can type up to three DNS Server IP

Addresses here. The Router will use these for quicker access to functioning

DNS servers.

WINS

The Windows Internet Naming Service (WINS) manages each PC’s

interaction with the Internet. If you use a WINS server, enter that

server’s IP

Address

here. Otherwise, leave this blank.

DHCP Clients Table

Click the

DHCP Clients Table

button to show the cur-

rent DHCP Active IP Table, shown in Figure 6-13. (This data is stored in tem-

porary memory and changes periodically.)

The DHCP Active IP

Table displays the IP

addresses

of

those

clients utilitizing the

Router’s DHCP func-

tion. To delete a client,

select the appropriate

field under the

Delete

button and click the

Delete

button.

To apply any of the settings you change on this page, click the

Apply

button.

To cancel any values you’ve entered on this page, click the

Cancel

button.

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From the DHCP screen, shown in Figure 6-12, you can configure the Router as

a DHCP Server.

A Dynamic Host Configuration Protocol (DHCP) server automatically assigns

an IP address to each PC on your network for you. Unless you already have one,

it is highly recommended that you leave the Router enabled as a DHCP server.

DHCP Server

DHCP is already enabled by factory default.

If you already

have a DHCP server on your network, set the Router’s DHCP option to

Disable

. Click the

Apply

button.

If you disable DHCP, remember to assign a

static IP address to the Router.

Starting IP Address

Enter a value for the DHCP server to start with when

issuing IP addresses.

This value must be 192.168.1.2 or greater, because the

Router’s default IP address is

192.168.1.1

.

DHCP

Figure 6-12

Figure 6-13

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EtherFast

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Cable/DSL Router with QoS and 8-Port Switch

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38

The Security tab, as shown in Figure 6-15, enables configuration of the Router

to provide parental controls.

AOL Parental Controls

Click on the radio button next to

Enable

to use AOL’s

“Parental Controls” feature. Enabling this will disable all options under the

Advanced tab except MAC Address cloning, and will disable all Internet access,

except when using AOL client software. Click the radio button next to

Disable

if

you don’t want to use this feature.

If at any time you enable the AOL Parental Controls feature in the Router, you

must run the Setup Wizard CD and select Setup Additional Computer(s) to install

the AOL 7.0 software on your computers.

To apply the settings that you change on a page, click the

Apply

button.

To can-

cel any values you’ve entered on a page, click the

Cancel

button.

Security

Figure 6-15

The Log tab, shown in Figure 6-14, provides you with a log of all incoming and

outgoing URLs or IP addresses for your Internet connection.

Access Log

To access activity logs, select the

Enable

option next to Access

Log. This function can be disabled by clicking the

Disable

radio button.

With logging enabled, you can choose to view temporary logs or have a per-

manent record.

Send Log to

For a permanent record of these logs, Logviewer software must

be used. This software can be downloaded from the Linksys website,

www.linksys.com

. The Logviewer saves all incoming and outgoing activity as a

permanent file on the hard drive of the PC running the Logviewer software. In

the

Send Log to

field, enter this PC’s fixed IP address. The Router will now

send updated logs to this PC.

Temporary logs can be accessed from the Log screen by clicking either the

Incoming Access Log

or

Outgoing Access Log

button. The Incoming Access

Log gives you a log of all the incoming Internet traffic while the Outgoing

Access Log lists all the URLs and IP addresses of Internet sites that users on

your network have accessed.

To clear the values you’ve entered on this page, click

Cancel

and re-enter infor-

mation. To apply any settings you’ve altered on this page, click the

Apply

but-

ton.

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Log

Figure 6-14

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To upgrade the Router’s firmware:

1.

Download the firmware upgrade file from

www.linksys.com

, and extract the

file using WinZip.

2. Select the

Help

tab (see Figure

6-16).

3. Click

Upgrade Firmware

to

display a new window (see

Figure 6-17).

4. Click the

Browse

button to

find the firmware upgrade file

you extracted.

5. Double-click the

firmware file

you extracted. Click the

Upgrade

button,

and follow the on-screen instructions.

The following instructions are for advanced users or users whose setup needs

require special configuration. When you click the Advanced tab, you will be

able to set up these features. There are six additional, Advanced tabs available.

Filters

- Filters block specific internal users from Internet access and enable

Virtual Private Network (VPN) sessions.

Forwarding

- Sets up public services on your network.

Dynamic Routing

- Sets up the Router so it will automatically adjust to phys-

ical changes in the network’s layout.

Static Routing

- Sets up static routes needed when network information must

travel to a specific host or network.

DMZ Host

- Allows one local user to be exposed to the Internet for use of spe-

cial-purpose services such as online gaming or videoconferencing.

Quality of Service

- Allows you to assign high or low priority to network traf-

fic for various applications and ports.

MAC Address Cloning

- Allows you to “clone” your Ethernet adapter’s MAC

address onto the Router.

39

Note:

By upgrading the Router’s firmware, you may lose the Router’s

configuration settings.

Figure 6-17

The Advanced Tabs

On the Help tab, shown in Figure 6-16, you’ll find links to all of the utility’s

internal support documentation, including the application that upgrades the

Router’s firmware.

Linksys Website

Clicking this link will take you to Linksys’s website,

www.linksys.com

, provided you are connected to the Internet.

Online manual in PDF format

and

Adobe Website

Clicking the Online man-

ual in PDF format link will take you to the latest version of the user guide for

this Router. The guide will be in Adobe Acrobat Portable Document File (.pdf)

format. You will need the Adobe Acrobat Reader to view this pdf. If you do not

have the Acrobat Reader, click the Adobe Website link to download it. These

links work only if you are connected to the Internet.

Upgrade Firmware

New firmware versions are posted at

www.linksys.com

and can be downloaded for free.

If the Router can access the Internet already,

there’s no need to download a newer firmware version, unless that version has

a new feature that you want to use. (To learn about any new firmware with new

features, visit

www.linksys.com

.) Loading new firmware onto the Router does

not always enhance the speed or the quality of your connection.

Help

Figure 6-16

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Filtered Private Port Range

•

To filter users by network port number, enter a network port number or a

range of network ports.

Enter the port numbers you want to filter in the port

numbers fields.

Users connected to the Router will no longer be able to

access any port number listed there. Click the

Apply

button when you’re

done.

Private MAC Filter

•

This

feature

filters

the

Ethernet

adapter’s

specific

MAC address from going out

to the Internet.

•

To

check

your

Ethernet

adapter’s MAC address, run

winipcfg

or

ipconfig

in the

command prompt, depending

on which Windows operating

system you are using.

To set

the MAC filter, click the

Edit

MAC Filter Setting

button.

When

a

second

window

appears (see Figure 6-19),

select the range in the drop-

down box, and at the MAC

number prompt, enter the 12-digit MAC address you want to filter. Click

the

Apply

button before closing the window. For information on obtaining

a MAC address, go to “Appendix F: Finding the MAC Address and IP

Address for Your Ethernet Adapter.”

Block WAN Requests

•

By enabling the Block WAN Request feature, you can prevent your network

from being “pinged,” or detected, by other Internet users. The Block WAN

Request feature also reinforces your network security by hiding your net-

work ports. Both functions of the Block WAN Request feature make it more

difficult for outside users to work their way into your network. This feature

is enabled by default.

Multicast Pass Through

•

This feature allows for multiple transmissions to specific recipients at the

same time.

Select

Enable

to enable the feature, or

Disable

to keep the

Router from multicasting.

Figure 6-19

From the Filters tab, shown in Figure 6-18, you can set up IP filters to block

specific internal users from accessing the Internet and enable Virtual Private

Network (VPN) sessions. You can set up filters by using IP addresses or net-

work port numbers (or a range of ports).

Filtered Private IP Range

•

To set up a filter using IP addresses, enter the range of IP addresses you

wish to filter in the IP address fields. Users with filtered IP addresses will

not be able to access the Internet at all. If you only want to filter one IP

address instead of a range of IP addresses, enter the same value into both

fields. For instance, if you wish to filter the PC with the IP address of

192.168.1.5, enter

5

into both fields on one line: 192.168.1.

5

~ 192.168.1.

5

.

Click the

Apply

button when finished.

IP Filtering

Figure 6-18

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From the Forwarding tab, shown in Figure 6-20, you can set up public services

on your network, such as web servers, ftp servers, e-mail servers, or other spe-

cialized Internet applications.

(Specialized Internet applications are any appli-

cations that use Internet access to perform functions such as videoconferencing

or online gaming. Some Internet applications may not require any forwarding.)

When users send this type of request to your network via the Internet, the

Router will forward those requests to the appropriate PC.

Before using Port

Range Forwarding, the Router’s DHCP function must be disabled under the

DHCP tab and the Router must be assigned a new static LAN IP address

because the IP address may change when using the DHCP server.

If you need to forward all ports to one PC, see the “DMZ” section.

To add a server using Port Range Forwarding:

1. Enter the

name

of the application in the appropriate Customized

Applications field.

Port Range Forwarding

Figure 6-20

IPSec Pass Through

•

This feature lets you use IPSec Pass Through.

IPSec Pass Through is

enabled by default.

•

To disable IPSec Pass Through, click on

Disable.

PPTP Pass Through

•

Point-to-Point Tunneling Protocol is the method used to enable VPN

sessions.

PPTP Pass Through is enabled by default.

•

To disable this feature, click on

Disable

next to

PPTP Pass Through

.

Remote Management

•

This feature allows you to manage the Router from a remote location, via

the Internet.

To enable this feature, click on

Enable,

and click the

Apply

button. Remote Management must be activated before you can manage the

Router from a remote location. If you wish to use this feature on the brows-

er, enter

http:\\<WAN IP Address>:8080.

(Enter your specific WAN IP

Address in place of <WAN IP Address>.)

•

To disable this feature, click on

Disable

.

Remote Upgrade

•

This feature allows you to upgrade the Router’s firmware from a remote

location.

To enable Remote Upgrade, click on

Enable

, and click the

Apply

button. Remote Management must be activated before you can manage the

Router from a remote location.

MTU (Maximum Transmission Unit)

•

This feature specifies the largest packet size permitted for network trans-

mission. Select

Enable

and enter the value desired.

You should leave this

value in the 1200 to 1500 range.

Most DSL users should use the value

1492

.

By default, MTU is set at

1500

when disabled.

To clear the values you’ve entered on this page, click

Cancel

and re-enter infor-

mation. To apply any settings you’ve altered on this page, click the

Apply

but-

ton.

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