LINKSYS WRT54GV81 Users Manual

Chapter 3

Advanced Configuration

• PPPoE: 1492

• PPTP or L2TP: 1460

Network Setup

The Network Setup section changes the settings on the network connected to the Router’s Ethernet ports. Wireless Setup is performed through the Wireless tab.

Router IP

This presents both the Router’s IP Address and Subnet Mask as seen by your network.

Router IP Address

Network Address Server Settings (DHCP)

The settings allow you to configure the Router’s Dynamic Host Configuration Protocol (DHCP) server function. The Router can be used as a DHCP server for your network. A DHCP server automatically assigns an IP address to each computer on your network. If you choose to enable the Router’s DHCP server option, make sure there is no other DHCP server on your network.

this dynamic IP address. After the time is up, the user will be automatically assigned a new dynamic IP address. The default is 0 minutes, which means one day.

Static DNS (1-3)

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, enter that IP Address in one of these fields. You can enter 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.

The Domain Name System (DNS) is how

Time Setting

Select the time zone in which your network functions from this drop-down menu. (You can even automatically adjust for daylight saving time.)

Time Setting

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

Network Address Server Settings (DHCP)

DHCP Server DHCP is enabled by factory default. If you

already have a DHCP server on your network, or you don’t want a DHCP server, then select Disable (no other DHCP features will be available).

Starting IP Address Enter a value for the DHCP server to

start with when is default IP address is 192.168.1.1, the Starting IP Address must be 192.168.1.2 or greater, but smaller than 192.168.1.253. The default Starting IP Address is 192.168.1.100

Maximum Number of DHCP Users Enter the maximum

number of PCs that you want the DHCP server to assign IP addresses to. This number cannot be greater than 253. The default is 50.

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”

suing IP addresses. Because the Router’s

Setup > DDNS

The Router offers a Dynamic Domain Name System (DDNS) feature. DDNS lets you assign a fixed host and domain name to a dynamic Internet IP address. It is useful when you are hosting your own website, FTP server, or other server behind the Router.

Before you can use this feature, you need to sign up for DDNS service with a DDNS service provider, www.dyndns.org or www.TZO.com. If you do not want to use this feature, keep the default setting, Disable.

DDNS

Before you can use this feature, you need to sign up for DDNS service at one of two DDNS service providers, DynDNS.org or TZO.com. If you do not want to use this feature, keep the default setting, Disable.

DDNS Service

If your DDNS service is provided by DynDNS.org, then select DynDNS.org from the drop-down menu. If your

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Advanced Configuration

DDNS service is provided by TZO, then select TZO.com. The features available on the DDNS screen will vary, depending on which DDNS service provider you use.

DynDNS.org

Setup > DDNS > DynDNS

User Name Enter the User Name for your DDNS account.

Password Enter the Password for your DDNS account.

Host Name The is the DDNS URL assigned by the DDNS

service.

Internet IP Address The Router’s Internet IP address is

displayed here. Because it is dynamic, it will change.

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

Setup > MAC Address Clone

A MAC address is a 12-digit code assigned to a unique piece of hardware for identification. Some ISPs will require you to register a MAC address in order to access the Internet. If you do not wish to re-register the MAC address with your ISP, you may assign the MAC address you have currently registered with your ISP to the Router with the MAC Address Clone feature.

Setup > MAC Address Clone

Status The status of the DDNS service connection is

displayed here.

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

TZO.com

Setup > DDNS > TZ O

E-mail Address, TZO Key, and Domain Name Enter the

settings of the account you set up with TZO.

MAC Address Clone

Enable/Disable To have the MAC Address cloned, select

Enable.

User Defined Entry Enter the MAC Address registered

with your ISP here.

Clone Your PC’s MAC Clicking this button will clone the

MAC address of the computer you are using.

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

Setup > Advanced Routing

This screen is used to set up the Router’s advanced routing functions. NAT routes the host Router ‘s network connection to the Internet. Dynamic Routing automatically adjusts how packets travel on your network. Static Routing sets up a fixed route to another network destination.

Internet IP Address The Router’s Internet IP address is

displayed here. Because it is dynamic, it will change.

Status The status of the DDNS service connection is

displayed here.

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Setup > Advanced Routing (Gateway)

Advanced Configuration

the Internet. Finally, selecting Both enables dynamic routing for both networks, as well as data from the Internet.

Select set number To set up a static route between the

Router and another network, select a number from the Static Routing drop-down list. (A static route is a predetermined pathway that network information must travel to reach a specific host or network.) Enter the information described below to set up a new static route. (Click the Delete This Entry button to delete a static route.)

Enter Route Name Enter a name for the Route here,

using a maximum of 25 alphanumeric characters.

Destination LAN IP The Destination LAN IP is the address

of the remote network or host to which you want to assign a static route.

Subnet Mask The Subnet Mask determines which

portion of a Destination LAN IP address is the network portion, and which portion is the host portion.

Setup > Advanced Routing (Router )

Advanced Routing

Operating Mode Select the mode in which this Router

will function. If this Router is hosting your network’s connection to the Internet, select Gateway. If another Router exists on your network, select Router. When Router is chosen, Dynamic Routing will be available as an option.

Dynamic Routing

Default Gateway This is the IP address of the gateway

device that allows for contact between the Router and the remote network or host.

Interface This interface tells you whether the Destination

IP Address is on the LAN & Wireless (Ethernet and wireless networks) or the WAN (Internet).

Delete This Entry To delete a route, select its number

from the drop-down menu, and click this button.

Show Routing Table Click Show Routing Table to open

a screen displaying how data is routed through your local network. For each route, the Destination LAN IP address, Subnet Mask, Gateway, and Interface are displayed. Click Refresh to update the information. Click Close to exit this screen.

Routing Table

Click Save Settings to apply your changes, or click Cancel

Changes to cancel your changes.

RIP This feature enables the Router to automatically

adjust to physical changes in the network’s layout and exchange routing tables with the other router(s). The Router determines the network packets’ route based on the fewest number of hops between the source and the destination. This feature is Disabled by default. From the drop-down menu, you can also select LAN & Wireless, which performs dynamic routing over your Ethernet and wireless networks. You can also select WAN (Internet), which performs dynamic routing with data coming from

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Wireless > Basic Wireless Settings

The basic settings for wireless networking are set on this screen.

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Wireless Network

Basic Wireless Settings

Advanced Configuration

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

Wireless > Wireless Security

The Wireless Security settings configure the security of your wireless network. There are six wireless security mode options supported by the Router: WPA Personal, WPA Enterprise, WPA2 Personal, WPA2 Enterprise, RADIUS, and WEP. (WPA stands for Wi-Fi Protected Access, which is a security standard stronger than WEP encryption. WPA2 is a more advanced, more secure version of WPA. WEP stands for Wired Equivalent Privacy, and RADIUS stands for Remote Authentication Dial-In User Service.) These six are briefly discussed here. For detailed instructions on configuring wireless security for the Router, refer to “Chapter 2: Wireless Security.”

The basic settings for wireless networking are set on this screen.

Wireless Network Mode From this drop-down menu,

you can select the wireless standards running on your network. If you have both 802.11g and 802.11b devices in your network, keep the default setting, Mixed. If you have only 802.11g devices, select G-Only. If you have only 802.11b devices, select B-Only. If you do not have any 802.11g and 802.11b devices in your network, select

Disable.

Wireless Network Name (SSID) The SSID is the network

name shared among all devices in a wireless network. The SSID must be identical for all devices in the wireless network. It is case-sensitive and must not exceed 32 characters (use any of the characters on the keyboard). Make sure this setting is the same for all devices in your wireless network. For added security, you should change the default SSID (linksys) to a unique name.

Wireless Channel channel from the list

provided to correspond with your network settings. All devices in your wireless network must be broadcast on the same channel in order to function correctly.

Wireless SSID Broadcast When wireless clients survey

the local area for wireless networks to associate with, they will detect the SSID broadcast by the Router. To broadcast the Router’s SSID, keep the default setting, Enable. If you do not want to broadcast the Router’s SSID, then select

Disable.

SecureEasySetup If you did not utilize this network

connection feature during the Setup Wizard, you may use it here by clicking the green logo. When you are prompted to start the push button setup, click OK.

Reset Security Use this button to reset the security

settings on your network. You will need to run SecureEasySetup again on each device on your network to re-associate it to your network.

Wireless Security

Security Mode

Select the security method for your wireless network. If you do not want to use wireless security, keep the default, Disabled.

WPA Personal

NOTE: If you are using WPA, always remember

that each device in your wireless network MUST use the same WPA method and shared key, or else the network will not function properly.

Security Mode > WPA Personal

WPA Algorithm WPA supports two encryption methods,

TKIP and AES, with dynamic encryption keys. Select the type of algorithm, TKIP or AES. (AES is a stronger encryption method than TKIP.)

WPA Shared Key Enter the key shared by the Router and

your other network devices. It must have 8-63 characters.

Group Key Renewal Enter a Key Renewal period, which

tells the Router how often it should change the encryption

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Advanced Configuration

keys. The default Group Key Renewal period is 3600 seconds.

WPA Enterprise

This option features WPA used in coordination with a RADIUS server. (This should only be used when a RADIUS server is connected to the Router.)

Security Mode > WPA Enterprise

WPA Algorithm WPA supports two encryption m ethods,

TKIP and AES, with dynamic encryption keys. Select the type of algorithm, TKIP or AES. (AES is a stronger encryption method than TKIP.)

Select the type of algorithm, AES, or TKIP + AES. The default selection is AES.

WPA Shared Key Enter a WPA Shared Key of 8-63

characters.

Group Key Renewal Enter a Group Key Renewal period,

which instructs the Router how often it should change the encryption keys. The default Group Key Renewal period is 3600 seconds.

WPA2 Enterprise

This option features WPA2 used in coordination with a RADIUS server. (This should only be used when a RADIUS server is connected to the Router.)

RADIUS Server Address Enter the IP Address of the

RADIUS server.

RADIUS Port Enter the port number of the RADIUS

server. The default value is 1812.

Shared Key Enter the key shared between the Router

and the server.

Key Renewal Timeout Enter a Key Renewal Timeout

period, which instructs the Router how often it should change the encryption keys. The default Key Renewal Timeout period is 3600 seconds.

WPA2 Personal

Security Mode > WPA2 Personal

WPA Algorithm WPA2 supports two encryption

methods, TKIP and AES, with dynamic encryption keys.

Security Mode > WPA2 Enterprise

WPA Algorithm WPA2 supports two encryption

methods, TKIP and AES, with dynamic encryption keys. Select the type of algorithm, AES, or TKIP + AES. The default selection is AES

RADIUS Server Address Enter the IP Address of the

RADIUS server.

RADIUS Port Enter the port number of the RADIUS

server. The default value is 1812.

Shared Key Enter the key shared between the Router

and the server.

Key Renewal Timeout Enter a Key Renewal Timeout

period, which instructs the Router how often it should change the encryption keys. The default Key Renewal Timeout period is 3600 seconds.

RADIUS

This option features WEP used in coordination with a RADIUS server. (This should only be used when a RADIUS server is connected to the Router.)

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Security Mode > WEP

Security Mode > RADIUS

IMPORTANT: If you are using WEP encryption,

always remember that each device in your wireless network MUST use the same WEP encryption method and encryption key, or else your wireless network will not function properly.

RADIUS Server Address Enter the IP Address of the

RADIUS server.

RADIUS Port Enter the port number of the RADIUS

server. The default value is 1812.

Shared Key Enter the key shared between the Router

and the server.

Default Transmit Key Select a Default Transmit Key

(choose which Key to use). The default is 1.

WEP Encryption Select a level of WEP encryption,

64 bits 10 hex digits or 128 bits 26 hex digits. The default is 64 bits 10 hex digits.

Passphrase Enter a Passphrase to automatically generate

WEP keys. Then click Generate.

Key 1-4 If you did not enter a Passphrase, enter the WEP

key(s) manually.

Default Transmit Key Select a Default Transmit Key

(choose which Key to use). The default is 1.

WEP Encryption Select a level of WEP encryption, 64 bits

10 hex digits or 128 bits 26 hex digits. The default is 64 bits 10 hex digits.

Passphrase Enter a Passphrase to automatically generate

WEP keys. Then click Generate.

Key 1-4 If you did not enter a Passphrase, enter the WEP

key(s) manually.

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

Wireless > Wireless MAC Filter

Wireless access can be filtered by using the MAC addresses of the wireless devices transmitting within your network’s radius.

WEP

WEP is a basic encryption method, which is not as secure as WPA.

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Wireless > Wireless MAC Filter

Wireless MAC Filter

either permitting or blocking access, click Enable. If you do not wish to filter users by MAC Address, keep the default setting, Disable

Prevent Select this to block wireless access by MAC

Address. This button is selected by default.

To filter wireless users by MAC Address,

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Advanced Configuration

Permit Only Select this to allow wireless access by MAC

Address. This button is not selected by default.

Edit MAC Filter List

Filter List screen. On this screen, you can list users, by MAC Address, to whom you wish to provide or block access. For easy reference, click Wireless Client MAC List to display a list of network users by MAC Address

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

Click this to open the MAC Address

MAC Address Filter List

Advanced Wireless

Authentication Type The default is set to Auto, which

allows either Open System or Shared Key authentication to be used. With Open System authentication, the sender and the recipient do NOT use a WEP key for authentication. With Shared Key authentication, the sender and recipient use a WEP key for authentication.

Basic Rate The Basic Rate setting is not actually one rate

of transmission but a series of rates at which the Router can transmit. The Router will advertise its Basic Rate to the other wireless devices in your network, so they know which rates will be used. The Router will also advertise that it will automatically select the best rate for transmission. The default setting is Default, when the Router can transmit at all standard wireless rates (1-2Mbps, 5.5Mbps, 11Mbps, 18Mbps, and 24Mbps). Other options are 1-2Mbps, for use with older wireless technology, and All, when the Router can transmit at all wireless rates. The Basic Rate is not the actual rate of data transmission. If you want to specify the Router’s rate of data transmission, configure the Transmission Rate setting.

Transmission Rate The rate of data transmission should

be set depending on the speed of your wireless network. You can select from a range of transmission speeds, or you can select Auto to have the Router automatically use the fastest possible data rate and enable the Auto-Fallback feature. Auto-Fallback will negotiate the best possible connection speed between the Router and a wireless client. The default value is Auto.

Wireless > Advanced Wireless Settings

This Wireless > Advanced Wireless Settings screen is used to set up the Router’s advanced wireless functions. These settings should only be adjusted by an expert administrator as incorrect settings can reduce wireless performance.

Wireless > Advanced Wireless Settings

CTS Protection Mode CTS (Clear-To-Send) Protection

Mode should remain disabled unless you are having severe problems with your Wireless-G products not being able to transmit to the Router in an environment with heavy

802.11b traffic. This function boosts the Router’s ability to catch all Wireless-G transmissions but will severely decrease performance.

Frame Burst Enabling this option should provide your

network with greater performance, depending on the manufacturer of your wireless products. To turn on the Frame Burst option, select Enable. The default is Disable.

Beacon Interval The default value is 100. Enter a value

between 1 and 65,535 milliseconds. The Beacon Interval value indicates the frequency interval of the beacon. A beacon is a packet broadcast by the Router to synchronize the wireless network.

DTIM Interval This value, between 1 and 255, indicates

the interval of the Delivery Traffic Indication Message (DTIM). A DTIM field is a countdown field informing clients of the next window for listening to broadcast and multicast messages. When the Router has buffered broadcast or multicast messages for associated clients, it sends the next DTIM with a DTIM Interval value. Its clients

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hear the beacons and awaken to receive the broadcast and multicast messages. The default value is 1.

Fragmentation Threshold This value specifies the

maximum size for a packet before data is fragmented into multiple packets. If you experience a high packet error rate, you may slightly increase the Fragmentation Threshold. Setting the Fragmentation Threshold too low may result in poor network performance. Only minor reduction of the default value is recommended. In most cases, it should remain at its default value of 2346.

RTS Threshold Should you encounter inconsistent data

flow, only minor reduction of the default value, 2347, is recommended. If a network packet is smaller than the preset RTS threshold size, the RTS/CTS mechanism will not be enabled. The Router sends Request to Send (RTS) frames to a particular receiving station and negotiates the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS) frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value of

2347.

AP Isolation This isolates all wireless clients and wireless

devices on your network from each other. Wireless devices will be able to communicate with the Router but not with each other. To use this function, select On. AP Isolation is turned Off by default.

SecureEasySetup This feature allows you to enable or

disable the SecureEasySetup feature. Select Disabled to disable the feature and turn off the button’s light. The feature is Enabled by default.

Firewall

Firewall Protection To use firewall protection, keep the

default selection, Enable. To turn off firewall protection, select Disable.

Block WAN Requests

Block Anonymous Internet Requests This feature

makes it more difficult for outside users to work their way into your network. This feature is selected by default. Deselect the feature to allow anonymous Internet requests

Filter Multicast Multicasting allows for multiple

transmissions to specific recipients at the same time. If multicasting is permitted, then the Router will allow IP multicast packets to be forwarded to the appropriate computers. This feature is selected by default. Deselect this feature to disable it.

Filter Internet NAT Redirection This feature uses

port forwarding to block access to local servers from local networked computers. Select Filter Internet NAT Redirection to filter Internet NAT redirection. This feature is not selected by default.

Filter IDENT (Port 113) This feature keeps port 113 from

being scanned by devices outside of your local network. This feature is selected by default. Deselect this feature to disable it.

Click Save Settings to apply your changes, or click Cancel Changes to cancel your changes.

Security > Firewall

The Security > Firewall screen is used to configure a firewall that can filter out various types of unwanted traffic on the Router’s local network.

Security > Firewall

Security > VPN Passthrough

The Security > VPN Passthrough screen allows you to enable VPN tunnels using IPSec, PPTP, or L2TP protocols to pass through the Router’s firewall.

Security > VPN Passthrough

VPN Passthrough

IPSec Passthrough Internet Protocol Security (IPSec) is

a suite of protocols used to implement secure exchange of packets at the IP layer. To allow IPSec tunnels to pass through the Router, keep the default, Enable.

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