Motorola SURFBOARD SBG1000 Guía de referencia rápida

As cable deployment continues to bring broadband to

the masses, it is now becoming easier to safeguard both

personal data and computing resources. The buildout of

cable access networks is encouraging cable subscribers to

connect multiple computers to share broadband connections.

Cable subscribers can connect multiple PCs using

combinations of wired and wireless Local Area Network

(LAN) technologies, allowing each of these PCs to share

a single broadband connection. Both home users and

companies need to protect against hacker attacks and

remove the risk of unauthorized users gaining entry

into the LAN.

Residential subscribers need the ability to safeguard

their home computing resources and personal information,

and Small Office Home Office (SOHO) users and Small

to Medium Enterprise (SME) users must protect the value

of their business information. Telecommuters and people

working from home after hours need to similarly protect

the integrity of company information.

The United States Federal Government recommends that

Internet users add firewall protection — a system designed

to prevent unauthorized access to or from a private network

and also warns that PCs without firewalls can be accessed

through their Internet connection. Without firewall

protection, users can lose valuable personal or corporate

information and they risk permanent damage to PCs and

peripherals. Multi-PC households, small businesses

and corporate telecommuters can all benefit from

easy-to-use firewalls that allow them to enjoy the

advantages of broadband Internet connections —

while avoiding the risk of intrusion.

Always-on broadband connections present particular

risks that must be addressed. It is critical that each LAN

is protected by a firewall. Without a firewall, anyone

on the Internet could theoretically access computing

resources and private data. Everyone operating a LAN

connected to the Internet should deploy a firewall that

secures the LAN and protects it against outside attack.

All traffic entering or leaving the LAN pass through

the firewall, which examines each traffic flow and

blocks flows that do not meet the specified security

criteria. There are different configurations for firewalls,

and cable subscribers need to ensure that they provide

the appropriate security levels.

Protecting Local Area Networks

with Easy-To-Use Firewalls

Wireless Cable Modem Gateway Family White Paper

Firewalls

Wireless Cable Modem Gateway Family

Security

Firewalls — An Overview

The primary purpose of a firewall is to provide a single

point of entry where defense can be implemented.

Firewalls allow access to resources on the Internet, and

public and private networks from devices on the LAN,

while preventing unauthorized access from the Internet

to the LAN.

The firewall must provide a method for system

administrators to configure access control lists to establish

the rules for access according to local policies. All access

should be logged to ensure adequate information for

a detailed security audit. But deployment should not be

a daunting task because most home or small business

networks do not have Information Technology

(IT) departments.

When selecting cable access equipment, subscribers should

make sure that access equipment offers pre-configured

firewall capabilities that are sufficient to meet their

needs. Set-it-and-forget-it is the right approach for

residential subscribers, but many gamers and small

business subscribers will want the flexibility and power

to customize the firewall for added levels of security

and flexibility.

LAN Security with the otorola Wireless Cable odem

Gateway Family

The Motorola Wireless Cable Modem Gateway Family

allows cable subscribers to easily secure LAN resources.

The SBG1000 includes a robust, flexible and easy-to-use

integrated firewall. This Data Over Cable Service

Interface Specification (DOCSIS) cable modem provides

unprecedented functionality in a single platform.

Subscribers can deploy this space-saving solution to

connect to the cable network and safely allow both wired

and wireless clients to share the broadband connection.

The Motorola SBG1000 Wireless Cable Modem Gateway

even includes a print server so that residential users, SOHO

subscribers and small businesses can reduce printing

costs by connecting a single printer as a shared resource

for Windows, Macintosh and Linux computers. Cable

subscribers can easily deploy wireless LANs, wired LANs

or hybrid wireless/wired LANs to share resources such as

hard-drives, printers and peripherals while protecting each

computer from outside intrusion. Only Motorola offers

such a compact, secure and full-featured solution that

allows cable subscribers to quickly and easily establish

secure LANs connected to broadband cable networks.

It includes an 802.11b wireless access point that allows

PCs to connect securely to the Internet without the

need for expensive home cabling.

The Motorola SBG1000 includes a router with a five-port

10/100Base-T Ethernet switch that allows wired PCs to

access the Internet and shared resources on the network.

Future versions of the Motorola Wireless Cable Modem

Gateway Family will include all of the features of the

SBG1000, and will also provide an enterprise-grade Virtual

Private Network (VPN) endpoint so users can create secure,

tunneled connections to corporate resources. For more

information, please download the VPN whitepaper available

at http://www.motorola.com/broadband/whitepapers.html.

White Paper

SURFboard ®

HIGH SPEED CABLE MODEM

Wireless

ACCESS POINT

Firewall

ADVANCED SECURITY

Print Server

WINDOWS | MAC | LINUX

Router

5-PORT 10/100 SWITCH

Printer

Laptops

PDAs

Desktop Computers

Firewall

High Speed

Internet

Access via

Cable

• 10/100 Ethernet

• USB

• NAT/NAPT

• IPSec VPN

802.11b

Wireless Networking

Internet

Wireless Cable Modem Gateway

Wireless Cable odem Gateway:

Typical network configuration

Fea tures

Advance Firewall Features on the otorola Wireless Cable

odem Gateway Family

A Web-based graphical user interface simplifies

configuration so the authorized administrator can create

customized levels of security. The full-featured firewall

capabilities of the Motorola SBG1000 come pre-configured

so users do not have to be security experts to effectively

protect their LAN. However, for those LAN connections

that require increased security or flexibility, the Motorola

SBG1000 can be easily customized to secure LAN

resources to desired levels. It contains the following

robust firewall features:

Network Address Translation

The Motorola SBG1000 Wireless Cable Modem Gateway

is an ethernet router and it also supports Network Address

Translation (NAT) so private Internet Protocol (IP)

addresses within the LAN can be automatically mapped

to the public IP address on the Gateway.

The cable operator issues an IP address to the SBG1000,

which includes an integrated Dynamic Host Control

Protocol (DHCP) server that issues dynamic IP addresses to

computers on the LAN. Smaller LANs can add PCs simply,

or in larger LANs network administrators can create a NAT

table that does the global-to-local and local-to-global IP

address mapping. The use of NAT allows increased

security since different levels of security can be defined for

each IP address on the LAN. Private IP addresses within

the LAN are hidden from the public Internet because

external users only see the IP address of the SBG1000.

The Motorola SBG1000 Wireless Cable Modem Gateway’s

implementation of NAT supports multi-session IPSec

VPN passthrough as well as H.323 video conferencing

standards. Authorized users can take advantage of the

built-in IPSec support to establish secure VPN tunnels to

enterprise resources. Multiple tunnels can be established

at a single time and multiple users can each establish a

tunnel. For example, a husband and wife on separate PCs

can tunnel into their respective employers’ VPNs at the

same time using the SBG1000.

As broadband connections deliver increased bandwidth

to the home, video conferencing is becoming more widely

deployed. Intelligence within the Motorola SBG1000

Wireless Cable Modem Gateway will identify video

conferencing sessions using the H.323 standard and allow

them to be established through the firewall so authorized

users can establish secure video conferencing over the

Internet. Firewall features within the SBG1000 will create

an opening to allow the H.323 sessions to be securely

established so video conferencing tunnels can be

easily established.

Wireless Cable Modem Gateway Family

Stateful Packet Inspection

The Wireless Cable Modem Gateway Family maintains

stateful information for every TCP/IP session at both the

network and transport layers. It monitors all incoming and

outgoing packets, applying policies to each one while

screening for improper packets and intrusion attempts. The

Motorola SBG1000 inspects and analyzes the state of each

traffic flow and offers programmable filters so authorized

users have the flexibility to optionally enforce specific rules

for port usage, blocking specific domains or implementing

customized security levels. The firewall within the SBG1000

Wireless Cable Modem Gateway analyzes the relationships

of the newly created session so new protocols can be

added to the firewall configuration. This allows maximum

flexibility for supporting additional protocols and new

services while maintaining a secure LAN connected to

the Internet.

The Motorola SBG1000 Wireless Cable Modem

Gateway comes pre-configured but users can also

customize stateful packet inspection to address the

following parameters:

• IP address and port numbers

• Packet count and byte count

• Sequence and acknowledgement number

• Time stamps

• Payload modification history

• Dynamic association

• Other identifying information requested

by the LAN administrator

Intrusion Detection

Attempts to infiltrate the LAN are monitored and repelled

by the Motorola SBG1000, which includes extensive

intrusion detection features to prevent unauthorized access.

If the system suspects that an external party has attempted

to crash through the firewall, it will attempt to identify the

IP address of the potential culprit, prevent access, log the

event and automatically generate an e-mail to the LAN

administrator with information about the intrusion event.

This information can even be shared with the cable

operator to help identify hackers and filter them off

the cable access network.

White Paper

The firewall within the SBG1000 Wireless Cable Modem Gateway

analyzes the relationships of the newly created session

so new protocols can be added to the firewall confi uration.

Denial of Service Attack Prevention

With the expansion of the Internet we often hear about

Denial of Service (DoS) attacks harming major Web

sites. Yahoo, Amazon and even the White House

Web sites have all been shut down by DoS attacks as

publicly reported in 2000. A DoS attack is an incident in

which users or organizations are deprived of the services

they would normally expect to have operational. In the

worst cases, LAN services may be temporarily forced to

cease operations or an intruder may gain access onto the

LAN to corrupt processing resources to support other

malicious attacks.

Although DoS attacks are usually intentional and malicious,

they can happen accidentally and they can cause

major damage to LAN computers and require a great

deal of downtime. These attacks can range from buffer

overflow attacks, in which more traffic is sent to the

LAN than it can handle, to Smurf attacks, in which the

perpetrator sends an IP ping to computers on the LAN

specifying that they broadcast to a number of hosts so

there will be innumerable ping replies that flood the

LAN so it can no longer receive or distinguish valid

Internet traffic.

The Motorola Wireless Cable Modem Gateway Family

comes pre-configured with extensive features for

preventing DoS attacks. Stateful packet inspection

features monitor traffic flows in real time for both

LAN sessions and Internet access sessions. The

SBG1000 Wireless Cable Modem Gateway detects

misuse of LAN resources and flags anomalies that may,

in fact, be suspicious traffic. It can be customized so future

DoS attacks can be catalogued and added so the LAN

can be protected for the long term. It also offers blockers

for the following DoS attack types, as well as over

20 additional attack types.

• SYN flooding • BackOrifice

• TCP hijacking • Net Bus

• LAN attack • Smurf

• WinNuke • ICMP flooding

• Christmas tree • Trojan Horse

• SYN/FIN

D Z Hosting

A Demilitarized Zone (DMZ) is a neutral zone between

the private LAN and the public Internet. It opens up a

computer for clear, non-secure connections to the outside,

and the machine becomes vulnerable to security threats.

Wireless Cable Modem Gateway Family

The SBG1000 monitors all incomin and out oin packets,

applyin policies to each one while screenin for intrusion attempts.

Resources

Because there are no security prevention safeguards in

place, there are also no potential link impediments either.

The use of a DMZ may therefore be desirable for

specialized applications, such as File Transfer Protocol

(FTP) or Web servers. The DMZ Hosting feature allows

one local computer to be exposed to the Internet for use

of a special-purpose service such as Internet gaming and

video conferencing.

The Motorola SBG1000 Wireless Cable Modem Gateway

serves as a DMZ to enable firewall security of protected

LAN resources. It not only offers NAT but also has

Network Address Port Translation (NAPT) to identify

source ports. For example, the firewall supports multiple

popular gaming protocols, including Quake, Unreal

Tournament, Hexen and EverQuest. The LAN administrator

can easily add support for a new gaming protocol so

online games can be established through the firewall.

The private LAN can remain secure, yet these specialized

sessions can be easily established.

The Efficiency of Shared Resources with the Security

of a Firewall

The Motorola SBG1000 Wireless Cable Modem Gateway

allows secure LAN connections to shared broadband

networks. It is a complete, out-of-the-box firewall solution

that combines vigorous security with compact, full-featured

wired and wireless networking.

This “plug ‘n’ play” solution comes with default settings

including a firewall that addresses the needs of most users

but can be easily configured and customized to support

even more rigorous levels of security. The Motorola

SBG1000 Wireless Cable Modem Gateway offers the

mobility of a wireless LAN and the flexibility of multi-port

Ethernet — behind the security of a firewall. Motorola,

the leading supplier of cable modems worldwide, offers

“plug ‘n’ play” router connectivity so multi-PC homes,

SOHO and SME business customers can cost effectively

share high speed Internet connections.

The Motorola SBG1000 Wireless Cable Modem Gateway

is available from both cable operators and retail channels

and is backed by the quality and reliability offered by

Motorola. Additional networking accessories are also

available from Motorola, including:

• 802.11b client cards for wireless access to the

Motorola SBG1000

• 802.11b Universal Serial Bus (USB) adapters for

adding wireless capabilities to a desktop computer

• External wired diversity high-gain antenna for

extending the reach of the wireless LAN

White Paper

Wireless Cable Modem Gateway Family White Paper

Motorola, Inc.

Broadband Communications Sector

101 Tournament Drive

Horsham, PA 19044

1.800.523.6678

www.motorola.com/broadband

MOTOROLA and the Stylized M Logo are registered in the

US Patent & Trademark Office. All other product or service

names are the property of their respective owners.

Specifications subject to change.

5419-402-5K

Residential users, SOHO customers and SME businesses

alike can deploy secure wireless and wired LANs

while managing the safety of computing resources

and the privacy of personal and business information.

Integrated firewall capabilities allow users to secure

LANs while gaining the peace of mind that comes

from knowing that their information and resources

are well protected.

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