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Chapter 3: Advanced Configuration
Illustrations contained in this document are for representation only.
33
Connection Web Page
This page reports diagnostic information about the initialization and operating status of your
gateway that can be useful at the time of installation. It can also be useful to your cable
company’s support technician if you’re having problems.
Fig.18
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Chapter 3: Advanced Configuration
34
Password Web Page
This page is used to set a password that enables you to access all the gateway internal web pages.
The password can be a maximum of 8 characters and is case sensitive. In addition, this page can
be used to restore the gateway to its original factory settings. Use this with caution, as all the
settings you have made will be lost. To perform this reset, set Restore Factory Defaults to YES
and click Apply. This has the same effect as a factory reset using the rear panel reset switch,
where you hold in the switch for 15 seconds, then release.
Fig. 19
Page 43 / 81
Chapter 3: Advanced Configuration
Illustrations contained in this document are for representation only.
35
Diagnostics Web Page
This page verifies you have IP connectivity from your gateway to other IP addresses on the LAN
side, such as when you want to confirm you have successfully configured one of your PCs for
TCP/IP operation.
When you ping an Internet device, you send a packet to its TCP/IP stack, and it sends one back to
yours. Enter the IP address you want to ping, then click Start Test. Wait a few seconds, then click
your web browser’s refresh button. Success reported in the Results box means IP connectivity is
working from your CM TCP/IP stack to the target’s stack.
Note: Firewalls may cause pings to fail but still provide you TCP/IP access to selected devices
behind them. Keep this in mind when pinging a device that may be behind a firewall. Ping is most
useful to verify connectivity with PCs you know have no firewall, such as your own PCs on your
LAN side.
Fig.20
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Chapter 3: Advanced Configuration
36
Network Web Page Group
WAN Web Page
This page gives you the ability to enter some data your cable company may require, as explained
before in Mandatory User Configuration. In addition, it enables you to view your WAN side IP
address and lease information.
Your gateway can provide NAT/PAT (Network and Port Address Translation) as an element of
security to prevent others from reaching your PCs when not authorized. To accomplish this, the
gateway watches packets you send from your PC to Internet sites. Each time you send to a site
(destination IP address) and application at that site (port), it translates your PC’s original IP and
source port to new ones, and adds a row to its Connection Table maintained internally. (Note the
different meaning of ‘connection’ here to describe an IP connection versus a physical cabling
connection). If and when that site/application replies, it looks up the connection and reverses the
IP/port process to direct the response to your PC.
The Connection Table manages itself, but you can also force this table to be cleared manually. To
do this, click the Renew NAT Lease button.
Fig. 21
You can enter a spoofed MAC address that causes your gateway networking stack to use that
MAC address when communicating instead of the usual WAN MAC address (CM label + 2, as
Page 45 / 81
Chapter 3: Advanced Configuration
Illustrations contained in this document are for representation only.
37
explained in Chapter 2). Enter the desired MAC address and click Apply.
Caution: If you enter a MAC address in use by another party, it can cause an address conflict on
the network that could affect both you and that party.
LAN and Computers Web Pages
These pages give you the ability to activate and deactivate the DHCP server function of your
gateway, and, if the DHCP server is activated, to see DHCP leases it has provided.
With this function activated, your cable company’s DHCP server provides one IP address for your
gateway, and your gateway’s DHCP server provides IP addresses, starting at the address you set
in IP Address on the LAN page, to your PCs. A DHCP server leases an IP address with an
expiration time.
To change the lowest IP address that your gateway will issue to your PCs, enter it into the IP
Address box and then click Apply.
To set the maximum number of PCs to which the gateway will issue IP addresses, enter it in the
Number of CPEs box and then click Apply. (CPE is another term sometimes used for PC.)
The Computers web page section shows leases the gateway DHCP server has made, including the
IP and MAC addresses of each PC’s TCP/IP stack. Since MAC addresses are unique and
permanently fixed into hardware, you can identify any PC listed by its MAC address. The gateway
provides leases for 7 days, and has an automatic renewal mechanism that will keep extending a
lease as long as the associated PC remains active. If your PC is set to “obtain an IP address
automatically,” it is set to perform DHCP each time it is rebooted.
You can cancel an IP address lease by selecting it in the DHCP Client Lease Info list and then
clicking the Force Available button. If you do this, you may have to perform a DHCP Renew on
that PC, so it can obtain a new lease.

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