Netgear CG3700EMR-1CMNDS User Manual
Wireless Cable Voice Gateway CG3700EMR-1CMNDS
User Manual
September 2013
202-11324-01
350 East Plumeria Drive
San Jose, CA 95134
USA
Wireless Cable V oice Gateway CG3700EMR-1CMNDS
Support
Contact your Internet service provider for technical support.
Trademarks
NETGEAR, the NETGEAR logo, and Connect with Innovation are trademarks and/or registered trademarks of
NETGEAR, Inc. and/or its subsidiaries in the United States and/or other countries. Information is subject to change
without notice. © NETGEAR, Inc. All rights reserved.
2
Contents
Chapter 1 Connect to the Gateway
Chapter 2 NETGEAR genie Basic Settings
Gateway Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Gateway Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Gateway Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Power Supply Manufacturers and Models . . . . . . . . . . . . . . . . . . . . . . . . .10
Position Your Gateway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Log In to Your Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
View the Gateway Home Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
BASIC Home Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
ADVANCED Home Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Join the Wireless Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Cable Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
View or Configure Your Wireless Network . . . . . . . . . . . . . . . . . . . . . . . . .16
Wireless Setup Screen Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Security Options Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Network Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Voice Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Chapter 3 NETGEAR genie ADVANCED Home
Internet Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
WAN Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
LAN Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
LAN TCP/IP Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
DHCP IP Pool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Address Reservation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Chapter 4 Security
Keyword Blocking of HTTP Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Block Services (Port Filtering) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Schedule Blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Chapter 5 Administration
View Gateway Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Cable Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Internet Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
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Wireless Settings (2.4 GHz and 5 GHz). . . . . . . . . . . . . . . . . . . . . . . . . 36
Router Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Network Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Back Up Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Restore Configuration Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Set Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
View Event Logs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Ping Utility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Traceroute Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
DS Throughput Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
US Throughput Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Wireless Channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Chapter 6 Advanced Settings
Advanced Wireless Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
View or Change WPS Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Wireless Card Access List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Port Forwarding and Port Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Remote Computer Access Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Port Triggering to Open Incoming Ports. . . . . . . . . . . . . . . . . . . . . . . . .53
Port Forwarding to Permit External Host Communications . . . . . . . . . .55
How Port Forwarding Differs from Port Triggering . . . . . . . . . . . . . . . . .55
Set Up Port Forwarding to Local Servers. . . . . . . . . . . . . . . . . . . . . . . . . .56
Add a Custom Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Edit a Port Forwarding Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Delete a Port Forwarding Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Application example: Making a Local Web Server Public . . . . . . . . . . .59
Set Up Port Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Dynamic DNS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Remote Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Universal Plug and Play. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Chapter 7 Troubleshooting
Troubleshoot with LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Cannot Log In to the Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Troubleshoot the ISP Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Troubleshoot a TCP/IP Network Using the Ping Utility . . . . . . . . . . . . . . .68
Test the LAN Path to Your Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Test the Path from Your Computer to a Remote Device . . . . . . . . . . . .69
Appendix A Supplemental Information
Factory Default Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
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Appendix B Notification of Compliance
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1. Connect to the Gateway
Getting to know your gateway
1
This chapter describes how to configure the Internet connection of your gateway and includes
these sections:
• Gateway Front Panel
• Gateway Rear Panel
• Gateway Label
• Power Supply Manufacturers and Models
• Log In to Your Gateway
• View the Gateway Home Screens
• Join the Wireless Network
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Gateway Front Panel
The gateway front panel has the buttons and status LEDs shown in the following figure.
WPS button / LED
Wireless button / 2.4 GHz LED
5 GHz LED
Power LED
Downstream LED
Upstream LED
Internet LED
LAN (Ethernet) LEDs
Phone LED
Figure 1. Gateway buttons and LEDs
You can use the LEDs to verify status and connections. The following table lists and
describes each LED and button on the front panel of the gateway.
Connect to the Gateway
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Table 1. Gateway LED descriptions
LED Description
• Solid green. The gateway has 5 GHz connectivity.
• Off.
The gateway does not have 5 GHz connectivity or the power is off.
Power
Downstream
Upstream
Internet
LAN (
Ethernet)
Ethernet)
LAN (
• Solid green. The
• Blinking green. Power-on self-test is in progress.
• Off.
• Solid green. More than one channel is locked (channel bonding).
• Blinking green.
• Off. No downstream channel is locked.
• Solid green. More than one channel is locked (channel bonding).
• Blinking green.
• Off. No upstream channel is locked.
• Solid green. The
• Blinking green.
• Off. The
• Solid green.
• Blinking green. Data is being transmitted or received on the Ethernet port.
• Off. The
• Solid green.
• Blinking green. Data is being transmitted or received on the Ethernet port.
• Off. The
The gateway does not have power.
gateway is offline.
powered on.
gateway does not detect an Ethernet device.
powered on.
gateway does not detect an Ethernet device.
gateway has power.
The unit is scanning for a downstream channel.
The unit is scanning for an upstream channel.
gateway is online.
The gateway is synchronizing with the CMTS of the cable provider.
The gateway detects an Ethernet device connected to the port and is
The gateway detects an Ethernet device connected to the port and is
• Solid green.
• Blinking green.
Phone
Button Description
WPS
Wireless On/Off
• Off.
Pressing this button opens a two minute window for the gateway to connect with other
WPS-enabled devices.
Turn the wireless radio in the gateway on and off. The wireless radio is on by default. The
LED located below this button indicates if the wireless radio is on or of
The gateway does not detect a phone connected to the phone port or the phone
is off line.
The gateway detects a phone connected to the port and is powered on.
A phone is connected to the phone port and is in use.
f.
Connect to the Gateway
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Gateway Rear Panel
The rear panel has the connections and buttons shown in the following figure.
Phone port
USB port (optional)
Ethernet LAN ports
Coaxial cable connector
Power adapter input
Power On/Off button
Reset button
Figure 2. Rear panel connections and buttons
The rear panel includes the following connections, viewed from top to bottom:
• Phone port. Connect a telephone to this port using an analog phone line.
• T
wo Gigabit Ethernet LAN ports. Use these ports to connect local computers.
• Coaxial cable connector. Attach
a coaxial cable to the cable service provider connection.
• Power adapter input. Connect the power adapter unit here.
• Power On/Off button. Press to turn on power
• Reset button.
You can return the gateway to its factory settings. Press and hold the
. Press again to turn off power.
Reset button for over seven seconds. The gateway resets and returns to its factory
settings. See Factory Default Settings on page 72.
Connect to the Gateway
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Gateway Label
The label on the gateway shows the PIN, login information, MAC address, serial number,
SSID, and WPA key.
Figure 3. The label shows unique information about your gateway
Power Supply Manufacturers and Models
Use only power supplies listed here:
• Adaptor of CWT
Manufacturer: Channel Well Technology Co., Ltd.
Model: SAS030F2
• Adaptor of PI
Manufacturer: PI Electronics (H.K.) Ltd.
Model: P030WE120B11200
Position Your Gateway
The range of your wireless connection can vary based on the physical placement of the
gateway. The latency, data throughput performance, and notebook power consumption of
wireless adapters also vary depending on your configuration choices.
For best results, place your gateway according to the following guidelines:
• Near the center of the area in which your computers operate.
• In an elevated location such as a high shelf where the wirelessly connected
computers have line-of-sight access (even if through walls).
• A
way from sources of interference, such as computers, microwave ovens, and 2.4
GHz cordless phones.
• A
way from large metal surfaces.
Connect to the Gateway
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• To reduce interference when using more than one access point, best practice is to
use channel spacing between adjacent access points (for example, use Channels 1
and 6, or 6 and 11).
Note: Failure to follow these guidelines can result in significant
performance degradation or inability to connect wirelessly to the
gateway.
Log In to Your Gateway
You can log in to the gateway to view or change its settings.
Note: To connect to the gateway, use a computer that is configured for
DHCP (most computers are). For help with configuring DHCP, see
the instructions that came with your computer.
The gateway automatically logs you out after five minutes of no activity.
To log in to the gateway:
1. On the computer that is connected to the gateway with an Ethernet cable, type
http://192.168.0.1 in the address field of your Internet browser
A login screen opens.
2. Log in with the user name admin and its default password of password.
The gateway BASIC Home screen displays when you log in (see BASIC Home Screen on
page 12).
.
View the Gateway Home Screens
The gateway home screens include a BASIC Home screen and an ADVANCED Home
screen.
Connect to the Gateway
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BASIC Home Screen
When you connect to the gateway, the gateway dashboard (BASIC Home screen) displays.
Menus (Click the ADVANCED tab to view more)
Dashboard
(Click to view
details)
Figure 4. NETGEAR genie BASIC home screen
The BASIC Home screen has a dashboard that shows the status of your Internet connection
and network. You can click the sections of the dashboard to view more detailed information.
The left column has menus and an ADVANCED tab displays at the top that you can use to
access more menus and screens.
The following options display on the BASIC home screen:
• Home.
This dashboard screen displays when you log in to the gateway or select the
Home tab.
• Cable Connection.
This option displays the cable signal quality , the upstream power, the
downstream power, and the connection status.
• W
ireless. Select this option to view or change the wireless settings for your gateway.
• Network Map. Select this option to view the devices that are connected to your network.
• V
oice. This option displays the voice status.
• ADV
ANCED tab. Click the ADVANCED tab to set up the gateway for unique situations
such as when remote access by IP or by domain name from the Internet is needed. See
ADVANCED Home Screen on page 13. Using this tab requires a solid understanding of
networking concepts.
For more information about the basic settings, see Chapter 2, NETGEAR genie Basic
Settings.
Connect to the Gateway
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ADVANCED Home Screen
Note: Using the ADVANCED Home screen requires a solid understanding
of networking concepts.
To view the ADVANCE Home screen, click the ADV
The gateway ADVANCED Home screen has a dashboard that lets you see the configuration
of your gateway and network at a glance. You can click any of the sections of the dashboard
to view more detailed information. The left column has the menus and at the top a BASIC tab
displays that you can use to access the basic menus and screens.
ANCED tab.
• ADV
• Setup. Set up the Internet connection, wireless settings, W
• Security. Block sites, block services, and set up email notifications.
• Administration. V
• Advanced Setup. Configure advanced network features such as port forwarding, port
• BASIC tab. Return to the BASIC Home screen. See BASIC Home Screen on page 12.
For more information about the advanced settings, see Chapter 3, NETGEAR genie
ADVANCED Home.
ANCED Home. This dashboard screen displays when you click the ADVANCED tab.
AN, and LAN.
iew gateway status, logs, and event logs, back up and restore the
configuration file, and change the gateway password.
triggering, Dynamic DNS, and UPnP
Connect to the Gateway
.
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Join the Wireless Network
To join the wireless network:
1. Open the software that manages your wireless connections on the wireless device
(laptop computer, gaming device, iPhone) that you want to connect to your gateway.
This software scans for all wireless networks in your area.
2. Look for your network and select it.
If you did not change the name of your network during the setup process, look for the
default WiFi network name (SSID) and select it. The default SSID is on the label on the
gateway.
3. Enter the gateway password and click the Connect button.
The default password is on the label on the gateway.
Connect to the Gateway
14
2. NETGEAR genie Basic Settings
Your Internet connection and network
2
This chapter explains the features available from the genie BASIC Home screen. This chapter
contains the following sections:
• Cable Connection
• View or Configure Your Wireless Network
• Network Map
• Voice Status
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Cable Connection
Use the Cable Connection screen to track the initialization procedure of the gateway, and to
get details about the downstream and upstream cable channel. The time is displayed after
the gateway is initialized.
The gateway automatically goes through the following steps in the provisioning process:
1. Scans and locks the downstream frequency and then ranges the upstream channels.
2. Obtains a W
3. Connects to the Internet.
To change the starting frequency:
From the BASIC tab, select Cable Connection.
AN address for the gateway.
The starting frequency is automatically generated. Most of the time, you do not need to enter
a value in this field. If you need to enter a starting frequency, contact your Internet service
provider.
View or Configure Your Wireless Network
The Wireless Setup screen lets you view or configure the wireless network set-up.
The wireless cable gateway comes with preset security. This means that the WiFi network
name (SSID), network key (password), and security option (encryption protocol) are preset in
the factory
. You can find the preset SSID and password on the label of the unit.
NETGEAR genie Basic Settings
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Note: The preset SSID and password are uniquely generated for every
device to protect and maximize your wireless security.
Best practice is not change your preset security settings. If you do decide to change
your preset security settings, make a note of the new settings and store it in a safe place.
If you use a wireless computer to change the wireless network name (SSID) or other wireless
security settings, you are disconnected when you click the
Apply button. To avoid this
problem, use a computer with a wired connection to access the gateway.
To view or change basic wireless settings:
1. From the BASIC tab, select W
ireless.
The screen sections, settings, and procedures are explained in the following sections.
2. Make the appropriate changes.
3. Click the Apply button.
Your settings are saved.
4. Set up and test your wireless devices and computers to make sure that they can connect
wirelessly
. If they do not, check the following:
• Is your wireless device or computer connected to your network or another wireless
network in your area? Some wireless devices automatically connect to the first open
network (without wireless security) that they discover
.
• Does your wireless device or computer appear on the Network Map screen? If it does,
it is connected to the network.
• If you are not sure what the network name (SSID) or password is, look on the label on
your gateway.
NETGEAR genie Basic Settings
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Wireless Setup Screen Fields
The Fragmentation Length, CTS/RTS Threshold, and Preamble Mode options in this screen
are reserved for wireless testing and advanced configuration only. Do not change these
settings unless you have a specific reason to do so.
• Region Selection. Select the location where the gateway is used.
• Enable W
the wireless interface, clear the Enable Wireless Gateway Radio check box, and click the
Apply button.
• Enable SSID Broadcast.
wireless stations can see this wireless name (SSID) in their scanned network lists. This
check box is selected by default. To turn off the SSID broadcast, clear this check box, and
click the Apply button.
• Name (SSID). The SSID is also known as the wireless network name. Enter a
32-character (maximum) name in this field.
is randomly generated, and best practice is not to change the SSID.
• Channel.
from 1 through 13. (For products in the North America market, only Channels 1 through
11 can be operated.) Do not change the channel unless you experience interference
(such as lost connections or slow data transfers). If any interference happens, experiment
with different channels to see which is the best.
• Mode. Up to 145 Mbps is the default and allows 802.1
join the network. g & b supports up to 54 Mbps. The 300 Mbps setting allows 802.11n
devices to connect at this speed.
ireless Gateway Radio. This setting enables the wireless interface. To turn off
This feature allows the gateway to broadcast its SSID so that
This field is case-sensitive. The default SSID
This setting is the wireless channel that the gateway uses. Choose a value
1n and 802.1 1g wireless devices to
Security Options Settings
The Security Options section of the Wireless Setup screen lets you change the security
option and password. Best practice is not to change the security option or password,
but if you want to change these settings, this section explains how.
CAUTION:
Do not disable security.
To change the WPA security option and password:
1. Under Security Options, select the WP
NETGEAR genie Basic Settings
A option that you want.
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2. In the password field that displays when you select a WP A security option, enter the network
key (password) that you want to use. It is a text string from 8 to 63 characters.
3. Click the Apply button.
Network Map
You can view all computers or devices that are currently connected to your network here.
To view a map of attached devices:
1. From the BASIC tab, select Network Map.
Wired devices are connected to the gateway with Ethernet cables. Wireless devices have
joined the wireless network. The following information displays:
• IP Address. The IP address that the gateway assigned to this device when it joined
the network. This number can change when a device disconnects and then rejoins
the network.
• Device Name. If the device name is known, it is shown here.
2. T
o update this screen, click the Refresh button.
NETGEAR genie Basic Settings
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Voice Status
You can review specific details about the voice connection.
To view the status of the voice connection:
From the BASIC tab, select V
The following fields display:
• MT
• MT
• MT
• MT
• MT
A Provision Status. The gateway status. The values can be Operational, No Security
Association, Disconnected, or N/A. This status applies to line 1.
A MAC Address. The telephony MAC address.
A IP Address. The telephony IP address.
A FQDN. The fully qualified domain name (FQDN). The Internet service provider
assigns this name.
A Telephony Signaling. This value is set to Media Gateway Control Protocol
(MGCP), a way to set up voice calls.
oice.
NETGEAR genie Basic Settings
20
3. NETGEAR genie ADVANCED Home
Specifying custom settings
3
This chapter explains the features available from the genie ADVANCED Home screen. This
chapter contains the following sections:
• Internet Setup
• WAN Setup
• LAN Setup
Some selections on the ADVANCED Home screen are described in separate chapters:
• Wireless Setup. See Chapter 2, Wireless Setup Screen Fields.
• Security. See Chapter 4, Security.
• Administration. See Chapter 5, Administration.
• Advanced Setup. See Chapter 6, Advanced Settings.
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Internet Setup
The Internet Setup screen is where you view or change ISP information.
To change the Internet settings:
1. Select ADV
2. Enter the settings for the IP address and DNS server.
The default settings usually work fine. If you have problems with your connection, check
the ISP settings.
3. Click the Apply button.
ANCED > Setup > Internet Setup.
Your settings are saved.
The following descriptions explain the fields in the Internet Setup screen.
Internet IP Address.
• Get Dynamically from ISP
with a fixed IP address, the gateway finds an IP address for you automatically when you
connect. Select this radio button.
• Use Static IP
you with the required information. Select this radio button and type the IP address, IP
subnet mask, and gateway IP address in the correct fields.
For example:
- IP Address. Enter 24.218.156.183.
- Subnet Mask. Enter 255.255.255.0.
- Gateway IP
Domain Name Server (DNS) Address.
that are based on their names.
Address. If you have a fixed (or static) IP address, your ISP has provided
Address. Enter 24.218.156.1.
. If you log in to your service or your ISP did not provide you
The DNS server is used to look up site addresses
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• Use These DNS Servers. If your ISP gave you one or two DNS addresses, select this
radio button and type the primary and secondary addresses.
• Get
Automatically from ISP. Your ISP uses DHCP to assign your DNS servers. Your
ISP automatically assigns this address.
Note: If you get address not found errors when you go to a website, it is
likely that your DNS servers are not set up correctly. Contact your
ISP to get the DNS server addresses.
WAN Setup
The WAN Setup screen lets you configure a DMZ (demilitarized zone) server and enable the
gateway to respond to a ping on the WAN (Internet) port.
To change the WAN settings:
1. Select ADV
The following screen displays:
2. Configure the following settings:
• Disable IPv4 Firewall Protection. Firewalls protect your gateway and connected
devices from external attacks.
• Disable Port Scan and DoS Protection. DoS protection protects your LAN against
denial of service attacks such as Syn flood, Smurf
Attack, UDP Flood, ARP Attack, Spoofing ICMP, Null Scan, and many others. Disable
this feature only in special circumstances.
• Default DMZ Server.
some online games and videoconferencing applications that are incompatible with
ANCED > Setup > WAN Setup.
The firewall is enabled by default.
Attack, Ping of Death, Teardrop
The default DMZ server feature is helpful when you are using
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Network Address Translation (NAT). The gateway is programmed to recognize some
of these applications and to work correctly with them, but some applications do not
function well. In some cases, one local computer can run the application correctly if
the IP address of that computer is entered as the default DMZ server.
Be careful when using this feature becuase it makes the firewall security less
effective.
• Respond to Ping on Internet Port. If you want the gateway to respond to a ping
from the Internet, select this check box. Use this feature only as a diagnostic tool
because it also allows your gateway to be discovered. Do not select this check box
unless you have a specific reason.
• MTU Size (in bytes). The normal MTU (maximum transmit unit) value for most
Ethernet networks is 1500 bytes, or 1492 bytes for PPPoE connections. For some
ISPs, you might need to reduce the MTU. Reduce the MTU only if you are sure that it
is necessary for your ISP connection.
• Disable SIP/ALG. The Session Initiation Protocol (SIP) Application Level Gateway
(ALG) is disabled by default, which is useful when you are running certain
applications. To enable SIP/ALG and optimize VoIP phone calls that use the SIP,
clear the check box.
WARNING:
DMZ servers pose a security risk. A computer that is designated
as the default DMZ server loses much of the protection of the
firewall and is exposed to exploits from the Internet. If
compromised, the DMZ server computer can be used to attack
other computers on your network.
The gateway discards incoming traffic from the Internet unless the traffic is a response to one
of your local computers or a service that you have configured in the Port Forwarding/Port
Triggering screen. Instead of discarding this traffic, you can have it forwarded to one
computer on your network. This computer is called the default DMZ server.
To set up a default DMZ server:
1. On the WAN Setup screen, select the Default DMZ Server check box.
2. Type the IP address.
3. Click the Apply button.
LAN Setup
The LAN Setup screen allows you to configure LAN services such as the IP address of the
gateway and DHCP. The TCP/IP and DHCP default values work fine in most cases.
The gateway is shipped preconfigured to use private IP addresses on the LAN side and to act
as a DHCP server. The default LAN IP configuration of the gateway is:
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