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Reference Manual for the Model CG814M Wireless Cable Modem Gateway
About This Manual
xi
About This Manual
Thank your for purchasing the NETGEAR
™
CG814M Wireless Cable Modem Gateway.
This manual describes the features of the gateway and provides installation and configuration
instructions.
Audience
This reference manual assumes that the reader has intermediate to advanced computer and Internet
skills. However, basic computer network, Internet, firewall, and VPN technologies tutorial
information is provided in the Appendices.
Typographical Conventions
This guide uses the following typographical conventions:
italics
Book titles and UNIX file, command, and directory names.
courier font
Screen text, user-typed command-line entries.
Initial Caps
Menu titles and window and button names.
[Enter]
Named keys in text are shown enclosed in square brackets. The notation
[Enter] is used for the Enter key and the Return key.
[Ctrl]+C
Two or more keys that must be pressed simultaneously are shown in text
linked with a plus (+) sign.
ALL CAPS
DOS file and directory names.
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Page 12 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
xii
About This Manual
Special Message Formats
This guide uses the following formats to highlight special messages:
Technical Support
For help with any technical issues, contact Customer Support at 1-888-NETGEAR, or visit us on
the Web at www.NETGEAR.com. The NETGEAR Web site includes an extensive knowledge
base, answers to frequently asked questions, and a means for submitting technical questions
online.
Note:
This format is used to highlight information of importance or special interest.
Warning:
This format is used to highlight information about the possibility of injury or
equipment damage.
Danger:
This format is used to alert you that there is the potential for incurring an
electrical shock if you mishandle the equipment.
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Page 13 / 102
Reference Manual for the Model CG814M Wireless Cable Modem Gateway
Introduction
1-1
Chapter 1
Introduction
This chapter describes the features of the NETGEAR CG814M Wireless Cable Modem Gateway.
About the CG814M Gateway
The NETGEAR CG814M Wireless Cable Modem Gateway connects directly to the wide area
network (WAN) using its built-in cable modem. It has multiple options to connect to your local
area network (LAN), including a 4-port 10/100 Mbps Ethernet switch, a USB port and an 802.11b
wireless Access Point.
The CG814M Gateway is a complete security solution that protects your network from attacks and
intrusions. Unlike simple Internet sharing routers that rely on Network Address Translation (NAT)
for security, the CG814M Gateway uses Stateful Packet Inspection for Denial of Service (DoS)
attack protection and intrusion detection. The CG814M Gateway provides highly reliable Internet
access for up to 253 users.
Key Features
The CG814M Gateway offers the following features.
Built-in Cable Modem
The CG814M Gateway connects directly the the WAN using an integrated cable modem. The
modem is DOCSIS 1.0 compliant and upgradable to DOCSIS 1.1, guaranteeing that it will work
with your local cable service provider.
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Reference Manual for the Model CG814M Wireless Cable Modem Gateway
1-2
Introduction
A Powerful, True Firewall
Unlike simple Internet sharing NAT routers, the CG814M Gateway is a true firewall, using stateful
packet inspection to defend against hacker attacks. Its firewall features include:
•
Denial of Service (DoS) protection
Automatically detects and thwarts Denial of Service (DoS) attacks such as Ping of Death,
SYN Flood, LAND Attack and IP Spoofing.
•
Configurable Port Forwarding, Port Blocking, Port Triggering and DMZ provide enough
flexibility for most applications.
•
Blocks access from your LAN to Internet locations or services that you specify as off-limits.
•
Logs security incidents
The CG814M Gateway will log security events such as blocked incoming traffic, port scans,
attacks, and administrator logins. You can configure the gateway to email the log to you at
specified intervals. You can also configure the gateway to send immediate alert messages to
your email address or email pager whenever a significant event occurs.
Content Filtering
With its content filtering feature, the CG814M Gateway prevents objectionable content from
reaching your PCs. The gateway allows you to control access to Internet content by screening for
keywords within Web addresses. You can configure the gateway to log and report attempts to
access objectionable Internet sites.
802.11b Standards-based Wireless Networking
The CG814M Gateway includes an 802.11b-compliant wireless access point, providing
continuous, high-speed 11 Mbps access between your wireless and Ethernet devices. The access
point provides:
•
802.11b Standards-based wireless networking at up to 11 Mbps
•
64-bit and 128-bit WEP encryption security
•
WEP keys can be generated manually or by passphrase
•
Wireless access can be restricted by MAC address.
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Reference Manual for the Model CG814M Wireless Cable Modem Gateway
Introduction
1-3
Configurable Auto Uplink™ Ethernet Connection
With its internal 4-port 10/100 switch, the CG814M Gateway can connect to either a 10 Mbps
standard Ethernet network or a 100 Mbps Fast Ethernet network. Both the local LAN and the
Internet WAN interfaces are autosensing and capable of full-duplex or half-duplex operation.
The gateway incorporates Auto Uplink
TM
technology. Each LOCAL Ethernet port will
automatically sense whether the Ethernet cable plugged into the port should have a ‘normal’
connection such as to a PC or an ‘uplink’ connection such as to a switch or hub. That port will then
configure itself to the correct configuration. This feature also eliminates the need to worry about
crossover cables, as Auto Uplink will accommodate either type of cable to make the right
connection.
USB Port
A USB connection to your computer eliminates the need for installing an Ethernet card.
Protocol Support
The CG814M Gateway supports the Transmission Control Protocol/Internet Protocol (TCP/IP).
Appendix B, "Networks, Routing, and Firewall Basics"
provides further information on TCP/IP.
•
IP Address Sharing by NAT
The CG814M Gateway allows several networked PCs to share an Internet account using only
a single IP address, which may be statically or dynamically assigned by your Internet service
provider (ISP). This technique, known as Network Address Translation (NAT), allows the use
of an inexpensive single-user ISP account.
•
Automatic Configuration of Attached PCs by DHCP
The CG814M Gateway dynamically assigns network configuration information, including
IP, gateway, and domain name server (DNS) addresses, to attached PCs on the LAN using the
Dynamic Host Configuration Protocol (DHCP). This feature greatly simplifies configuration
of PCs on your local network.
•
DNS Relay
When DHCP is enabled and no DNS addresses are specified, the gateway provides its own
address as a DNS server to the attached PCs. The gateway obtains actual DNS addresses from
the ISP during connection setup and forwards DNS requests from the LAN.
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