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Reference Manual for the Wireless Cable Modem Gateway CG814WG v2
About This Manual
1-1
Chapter 1
About This Manual
Congratulations on your purchase of the CG814WG v2 Wireless Cable Modem Gateway. The
CG814WG v2 provides connection for multiple personal computers to the Internet. It connects
directly to your cable line using an embedded DOCSIS 2.0 cable modem.
Audience, Conventions, Publication Date
This reference manual assumes that the reader has basic-to-intermediate computer and Internet
skills. However, basic computer network, Internet, firewall, and networking technology tutorial
information is provided in the Appendices.
This guide uses the following typographical conventions:
This guide uses the following formats to highlight special messages:
This manual is written f according to these specifications.:
Table 1-1.
Typographical conventions
italics
Emphasis, books, CDs, URL names
bold time
User input
courier font
Screen text, file and server names, extensions, commands, IP addresses
Note:
This format is used to highlight information of importance or special interest.
Table 1-2.
Firmware Version and Manual Publication Date
Firmware Version
2.95r09
Manual Publication Date
January 2005
Page 12 / 122
Reference Manual for the Wireless Cable Modem Gateway CG814WG v2
1-2
About This Manual
How to Print this Manual
To print this manual you can choose one of the following several options, according to your needs.
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Printing a Chapter
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link at the top right of any page.
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Click “PDF of This Chapter” link at the top right of any page in the chapter you want to
print. A new browser window opens showing the PDF version of the chapter you were
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Click the print icon in the upper left of the window.
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Tip
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paper and printer ink by selecting this feature.
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Printing the Full Manual
. Use the PDF button in the toolbar at the top right of the browser
window.
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Click PDF button. A new browser window opens showing the PDF version of the chapter
you were viewing.
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Click the print icon in the upper left of the window.
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Tip
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paper and printer ink by selecting this feature.
Page 13 / 122
Reference Manual for the Wireless Cable Modem Gateway CG814WG v2
Introduction
2-1
Chapter 2
Introduction
This chapter describes the features of the NETGEAR CG814WG v2 Wireless Cable Modem
Gateway.
About the CG814WG v2
The NETGEAR CG814WG v2 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 CG814WG v2 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 CG814WG v2 uses Stateful Packet Inspection for Denial of
Service (DoS) attack protection and intrusion detection. The CG814WG v2 provides highly
reliable Internet access for up to 253 users.
Key Features
The CG814WG v2 offers the following features.
Built-in Cable Modem
The CG814WG v2 Gateway connects directly the WAN using an integrated cable modem. The
modem is DOCSIS 2.0, guaranteeing that it will work with your local cable service provider.
A Powerful, True Firewall
Unlike simple Internet sharing NAT routers, the CG814WG v2 is a true firewall, using stateful
packet inspection to defend against hacker attacks. Its firewall features include:
Page 14 / 122
Reference Manual for the Wireless Cable Modem Gateway CG814WG v2
2-2
Introduction
•
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 CG814WG v2 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
whenever a significant event occurs.
Content Filtering
With its content filtering feature, the CG814WG v2 prevents objectionable content from reaching
your PCs. The gateway allows you to control access to Internet content by screening for keywords
within Web addresses.
Dual login allows an adult to configure content filtering, while still allowing a child to configure
other features of the gateway.
802.11b and 802.11g Standards-based Wireless Networking
The CG814WG v2 Gateway includes an 802.11g- and 802.11b-compliant wireless access point,
providing continuous, high-speed 54 Mbps access between your wireless and Ethernet devices.
The access point provides:
•
802.11g Standards-based wireless networking at up to 54Mbps
•
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.
Configurable Auto Uplink™ Ethernet Connection
With its internal 4-port 10/100 switch, the CG814WG v2 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.
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Reference Manual for the Wireless Cable Modem Gateway CG814WG v2
Introduction
2-3
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 for your computer eliminates the need for installing an Ethernet card.
Protocol Support
The CG814WG v2 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 CG814WG v2 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 CG814WG v2 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.
Easy Installation and Management
You can install, configure, and operate the CG814WG v2 within minutes after connecting it to the
network. The following features simplify installation and management tasks:
•
Browser-based management
Browser-based configuration allows you to easily configure your gateway from almost any
type of personal computer, such as Windows, Macintosh, or Linux. A user-friendly Setup
Wizard is provided and online help documentation is built into the browser-based Web
Management Interface.

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