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Page 56 / 131 Scroll up to view Page 51 - 55
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.
Page 57 / 131
6381-A4 Router Users Guide
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
.
Page 58 / 131
6381-A4 Router Users Guide
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.
Page 59 / 131
6381-A4 Router Users Guide
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.
Page 60 / 131
6381-A4 Router Users Guide
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
.

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