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Reference Manual for the Model CG814M Wireless Cable Modem Gateway
5-4
Managing Your Network
Connection Status
From the Main Menu, under Maintenance, select Connection to view the screen in
Figure 5-2
.
Figure 5-2:
Connection screen
This screen shows detailed information about the status of the connection to your cable service
provider that can be used for troubleshooting. The gateway goes through the following steps to be
provisioned
1.
Acquire and lock Downstream Channel
2.
Acquire upstream parameters and range.
3.
Lock Upstream Channel
4.
Acquire IP Address through DHCP
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Page 57 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
Managing Your Network
5-5
Current System Time
The date and time is acquired from your cable service provider as part of the registration
procedure.
Configuring LAN IP Settings
The LAN IP Setup menu allows configuration of LAN IP services such as the IP address of the
gateway and DHCP. These features can be found under the Advanced heading in the Main Menu
in the LAN IP menu.
LAN IP Setup
The gateway is shipped preconfigured to use private IP addresses on the LAN side, and to act as a
DHCP server. The gateway’s default LAN IP configuration is:
•
LAN IP addresses—192.168.0.1
•
Subnet mask—255.255.255.0
These addresses are part of the IETF-designated private address range for use in private networks,
and should be suitable in most applications. If your network has a requirement to use a different IP
addressing scheme, you can make those changes in this menu.
The LAN TCP/IP Setup parameters are:
•
LAN IP Address
This is the IP address of the gateway.
•
Subnet Mask
This is the LAN Subnet Mask of the gateway. Combined with the IP address, the Subnet Mask
allows a device to know which other addresses are local to it, and which must be reached
through a gateway or router.
Note:
If you change the LAN IP address of the gateway while connected through the
browser, you will be disconnected. You must then open a new connection to the new IP
address and log in again.
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Page 58 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
5-6
Managing Your Network
DHCP
By default, the gateway will function as a DHCP (Dynamic Host Configuration Protocol) server,
allowing it to assign IP, DNS server, and default gateway addresses to all computers connected to
the router's LAN. The assigned default gateway address is the LAN address of the gateway. IP
addresses will be assigned to the attached PCs from a pool of addresses specified in this menu.
Each pool address is tested before it is assigned to avoid duplicate addresses on the LAN.
For most applications, the default DHCP and TCP/IP settings of the gateway are satisfactory. See
“IP Configuration by DHCP” on page B-10
” for an explanation of DHCP and information about
how to assign IP addresses for your network.
Use router as DHCP server
If another device on your network will be the DHCP server, or if you will manually configure the
network settings of all of your computers, select NO for the DHCP Server, otherwise leave Yes
selected.
Specify the pool of IP addresses to be assigned by setting the Starting IP Address and Ending IP
Address. These addresses should be part of the same IP address subnet as the gateway’s LAN IP
address. Using the default addressing scheme, you should define a range between 192.168.0.10
and 192.168.0.253. The range of IP addresses between 192.168.0.2 and 192.168.0.9 can be used
for devices with fixed addresses.
The gateway will deliver the following parameters to any LAN device that requests DHCP:
•
An IP Address from the range you have defined
•
Subnet Mask
•
Gateway IP Address is the gateway’s LAN IP address
•
Primary DNS Server, if you entered a Primary DNS address in the Basic Settings menu;
otherwise, the gateway’s LAN IP address
•
Secondary DNS Server, if you entered a Secondary DNS address in the Basic Settings menu.
Note:
The gateway implements a DNS Relay function. When it receives a DNS request
on the LAN, it passes it to the DNS server specified on the WAN. It then relays the
response back to the original requesting PC.
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Page 59 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
Managing Your Network
5-7
Viewing and Emailing Logged Information
The gateway will log security-related events such as denied incoming service requests, hacker
probes, and administrator logins. If you enabled content filtering, the Logs page shows you when
someone on your network tried to access a blocked site. You can enable e-mail notification to
receive these logs in an e-mail message. An example is shown below.
Figure 5-3: Logs menu
Log entries are described in
Table 5-4
Table 5-4:
Security Log entry descriptions
Field
Description
Description
The type of event and what action was taken if any.
Count
This is a reference number for each event.
Last Occurrence
The date and time the log entry was recorded.
Target
The name or IP address of the destination device or website.
Source
The IP address of the initiating device for this log entry.
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Page 60 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
5-8
Managing Your Network
Enabling Logs Event E-mail Notification
In order to receive logs and alerts by e-mail, you must provide your e-mail information in the
E-Mail section of the Logs menu:
•
In the Contact Email Address, type the e-mail address to which the logs will be sent. Use a full
e-mail address (for example, [email protected]).
•
In the SMTP Server Name box, type the outgoing SMTP mail server of your ISP (for example,
mail.myISP.com). You may be able to find this information in the configuration menu of your
e-mail program. If you leave this box blank, no alerts or logs will be sent.
•
Check the E-mail Alerts Enable box.
•
Click E-mail Log to send the log immediately.
•
Click Apply
Erasing Configuration
The configuration settings of the CG814M Gateway are stored in a configuration file in the
gateway. This file can be reverted to factory default settings. The procedures below explain how to
do these tasks.
It is sometimes desirable to restore the gateway to the factory default settings. This can be done by
using the Erase function.
1.
To erase the configuration, from the Main Menu, under Maintenance select Set Password.
Select Yes for Restore Factory Defaults and click Apply.
2.
The gateway will then reboot automatically.
After an erase, the gateway's password will be
password
, the LAN IP address will be
192.168.0.1, and the router's DHCP client will be enabled.
Note:
To restore the factory default configuration settings without knowing the login password or
IP address, you must use the Default Reset button on the rear panel of the gateway.
1.
Using a paper clip, depress and hold the Default Reset Button. All the numbered Ethernet
LEDs will illuminate green.
2.
Continue to depress the button for at least 5 seconds.
3.
The gateway will reboot and clear its configuration information.
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