6381-A4 Router Users Guide

56

4.

Select the “Enable DHCP Server” radio button.

5.

In the

Start IP

text box enter a Start IP address.

The Start IP Address is where the DHCP server starts issuing IP addresses. This value must

be greater than the router's IP address value. For example, if the router's IP address is

192.168.1.1 (the default) than the Start IP address must be 192.168.1. 2 or higher.

6.

In the

End IP

text box enter the end IP address.

The End IP Address is the last address the DHCP server can issue. The ending address

cannot exceed a subnet limit of 254. The maximum IP address for a router using the default

address is 192.168.1.254. If the DHCP server runs out of DHCP addresses, users will not

get access to network resources. If this situation occurs, you can increase the Ending IP

address (to the limit of 254) or reduce the lease time.

Note:

If you change the start or end values, make sure the values are still within the same

subnet as the router's IP address. For example, if the router's IP address is 192.168.1.1 (the

default), and you change the DHCP Start and End IP addresses to be 192.128.1.2 and

192.128.1.100, you will not be able to communicate with the router if your PC has DHCP

enabled.

7.

In the

Lease Time

text box enter the number of seconds a user will be allowed to be

connected to the router with their dynamic IP address.

The Lease Time is the amount of time a network user will be allowed connection to the

Router with their current dynamic IP address. The amount of time is in units of seconds; the

default value is 3600 seconds (1 hour).

8.

Click

Apply

The Apply button will temporarily save this connection. To make the change permanent, click

Tools

(at the top of the page) and select

System Commands

. On the

System Commands

page, click

Save All

.

In addition to the DHCP server feature, the router supports the DHCP relay function. When the

router is configured as DHCP server, it assigns the IP addresses to the LAN clients. When the

router is configured as DHCP relay, it is responsible for forwarding the requests and responses

negotiating between the DHCP clients and the server.

If the DHCP server and relay are turned off, you must configure the IP address, subnet mask and

DNS settings of every computer on your network. Do not assign the same IP address to more

than one computer. Your router must be on the same subnet as the computers.

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57

Changing the Router's IP address

Your router's default IP address and subnet mask are 192.168.1.1 and 255.255.255.0,

respectively. This subnet mask allows the router to support 254 users. Since the DHCP server

issues a maximum of 255 addresses, there is not much advantage to changing the subnet mask

to increase the number of addresses. Further, remember that if you change your router’s IP

address and you have DHCP enabled, the DHCP configuration must reside within the same

subnet.

The default gateway is the routing device used to forward all traffic that is not addressed to a

station within the local subnet. Your ISP will provide you with the default gateway address.

The Hostname can be any alphanumeric word beginning with a letter and containing no spaces.

The domain name is used to in conjunction with the host name to uniquely identify the router.

To change the router's IP address:

1.

In the navigation bar at the top of the screen, click

Setup

.

2.

Under

LAN Setup

, select LAN Configuration.

This will bring up the

LAN Configuration Screen

.

3.

In the LAN Group 1 window click the

Configuration

link.

The LAN Group 1 Configuration screen appears.

4.

Select the “Use the following Static IP Address” radio button.

5.

In the

IP Address

text box enter a new IP Address.

6.

In the

Netmask

text box enter a new Netmask.

7.

Click

Apply

The Apply button will temporarily save this connection. To make the change permanent, click

Tools

(at the top of the page) and select

System Commands

. On the

System Commands

page, click

Save All

.

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58

Log Out

To log out of configuration screen at any time

1.

When the

Setup

,

Advanced

,

Tools

,

Status

, or

Help

screens are selected, click

Log Out

.

From the

Home

page click the

Log Out

button.

2.

Click the

Save

button to save your configurations and then click on

Log Out

to exit.

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59

Advanced

The modem supports a multitude of advanced features. For basic modem functionality you do not

need to utilize these advanced features. The features help with routing, security, port

configuration, and plug-and-play capability.

UPnP

The 6381 supports a control point for Universal plug and play (UPnP), version 1.0 and supports

two key features: NAT traversal and Device Identification. This feature requires an active WAN

connection. In addition, the PC should support this feature.

The UPnP application sits on top of a HTTP based socket listening for UPnP requests. With NAT

Traversal, when an UPnP command is received to open ports in NAT, the application translates

the request into IP table commands to open the ports in NAT and the firewall, mapping them back

to the IP address of the PC on the LAN making the request. The connection to open the ports on

is given to UPnP when it starts up and is part of the configuration of the application.

For Device Identification, the application will send a description of the 6381 RG as a control point

back to the device making the request. An example of how this works is with Windows XP. You

can go into the network for Windows XP and you will see the RG represented. You can then click

on the RG and get access to its web pages.

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60

To enable UPnP, you must first have a WAN connection configured. Once a WAN connection is

configured:

1.

From the navigation bar at the top of the screen click

Advanced

2.

From the left hand navigation pane select

UPnP

.

This will bring up the screen shown below.

3.

Check

Enable UPnP

and then select which connection (

WAN

or

LAN

) will utilize UPnP.

4.

Click

Apply

The Apply button will temporarily save this connection. To make the change permanent, click

Tools

(at the top of the page) and select

System Commands

. On the

System Commands

page, click

Save All

.