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.

36

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

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.

38

Figure 13. Example of Backup Page

39

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