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In the unusual event that you have a separate DHCP server on your LAN, you can disable the cable
modem/router’s DHCP server by selecting the No radio button. If you do this, make sure the IP
address assigned to the cable modem/router is on the same subnet as that of the external DHCP
server, or you won’t be able to access the cable modem/router from the LAN. The base LAN IP
address of the cable modem/router can be set from the Basic Setup page.
Note that the cable modem/router will only operate on a class C subnet, with subnet mask
255.255.255.0
You may also want to disable the DHCP server if you have assigned static IP addresses to all devices
on your network.
Table 7. DHCP Menu Options
Option
Description
DHCP Server
Select Yes to use internal DHCP server of the cable modem/router, or select
No to disable it.
Starting Local
Address
Configure the starting IP address for IP leases available to devices on the
LAN.
Number of
CPEs
Configure the number of PCs supported on the LAN.
Lease Time
Configure the time a lease will last before it must be renewed. Default is 3600
seconds , or 1 hour.
DDNS
The DDNS page allows you to make use of a DDNS server. Dynamic DNS (DDNS) allows a
dynamic IP address to be aliased to a static, pre-defined host name so that the host can be easily
contacted by other hosts on the internet even if its IP address changes. This means you can host a
server on your LAN that can be accessed from anywhere on the Internet.
Caution:
Some service providers may consider connection of such a server to be a breach of your
service agreement.
The cable modem/router supports a dynamic DNS client compatible with the Dynamic DNS service
(
). You must sign up with this service if you want to use it.
To access the
DDNS
page:
1
Click
Basic
in the menu bar.
2
Then click the
DDNS
submenu.
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Figure 12 shows an example of the menu and Table 8 describes the items you can select.
Figure 12. Example of DDNS Page
To activate the DDNS client:
1
Go to the DynDNS website and create an account for the
Dynamic DNS
service.
2
You will create a
username
and
password
, and be asked to choose a
host name
for your server,
and the dynamic DNS domain to which your host will be assigned.
3
You will also be asked for your host’s current
IP address
. This is the WAN IP address that has
been assigned to your cable modem/router during provisioning. (See WAN IP Address on the
Basic / Setup web page.)
4
Enter your account information on the Basic / DDNS web page, enable the service by selecting
www.DynDNS.org from the
DDNS Service
drop-down list, and click
Apply
.
5
The DDNS client will notify the DDNS service whenever the WAN IP address changes so that
your chosen host name will be resolved properly by inquiring hosts. The current status of the
service is shown at the bottom of the DDNS web page.
37
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Table 8. DDNS Menu Option
Option
Description
DDNS Service
Select the type of service that you are registered for from your DDNS service
provider.
User Name
Enter your DDNS account username subscribed to the service provider.
Password
Enter the password of the account.
Host Name
Enter the host name of your service host.
IP Address
Shows the current WAN side public IP address.
Status
Shows the status of DDNS service.
Backup
Note:
Some versions may not support this feature.
The Backup page allows you to save the current cable modem/router configuration settings to a local
PC. You can then later restore these settings if you need restore a particular configuration, or to
recover from changes you may have made that have had an undesirable effect.
To backup the current configuration:
Click
Backup
and follow the prompts.
To restore a previous configuration:
Click
Browse
and use the navigation window to locate the file. (Usually cable modem/router
Settings.bin, unless you rename it before saving.) Once the file has been located, click
Restore
to
restore the settings.
Note
: Once the settings are restored, the device will reboot.
To access the
Backup
page:
1
Click
Basic
in the menu bar.
2
Then click the
Backup
submenu.
Figure 13 shows an example of the menu.
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Figure 13. Example of Backup Page
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5
Advanced Menu Options
The Advanced Menu lets you:
¾
Enable advanced features of the cable modem/router
¾
Configure LAN IP address, MAC address, and port number filtering
¾
Configure WAN to LAN port forwarding and triggers
¾
Configure DMZ hosting
¾
Configure RIP parameters
Options
The Options page allows you to configure the cable modem/router to operate in different modes that
adjust how the device routes IP traffic.
To access the
Options
page:
1
Log in to the
Configuration Manager
(see page 13 for instructions).
2
Click
Advanced
in the menu bar.
3
Then click the
Options
submenu.
Figure 14 shows an example of the menu and Table 9 describes the items you can select.
40

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