McAfee FIREWALL 2.1-GETTING STARTED User manual

McAfee Firewall
Getting Started
Version 2.10

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Copyright © 2000 Network Associates, Inc. and its Affiliated Companies. All Rights Reserved. No part
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Issued May 2000/ McAfee Firewall v2.10

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Getting Started iii

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iv McAfee Firewall

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Getting Started v

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vi McAfee Firewall

Getting Started vii
Table of Contents
Chapter 1. Welcome to McAfee Firewall . . . . . . . . . . . . . . . . . . . . . . . . .11
About McAfee Firewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
How McAfee Firewall works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
About McAfee Firewall documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
McAfee Firewall online Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Frequently Asked Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
How will McAfee Firewall help me? . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
How is my PC at risk on the Internet? . . . . . . . . . . . . . . . . . . . . . . . . . . .14
What other protection do I need? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Are there any data packets that McAfee Firewall cannot stop? . . . . . .15
What network devices does McAfee Firewall support? . . . . . . . . . . . . .15
What protocols can McAfee Firewall filter? . . . . . . . . . . . . . . . . . . . . . . .15
How can I still be harassed, even with McAfee Firewall? . . . . . . . . . . . .16
Chapter 2. Installing McAfee Firewall . . . . . . . . . . . . . . . . . . . . . . . . . . .17
System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
About Winsock 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Installing McAfee Firewall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Troubleshooting installation problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Step 1: Clean up your hard drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Step 2: Remove temporary files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Step 3: Close other software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Chapter 3. McAfee Firewall Configurations . . . . . . . . . . . . . . . . . . . . . . .21
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Control applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Default settings for applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Default settings for System activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Instructions for Administrators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Table of Contents
viii McAfee Firewall
Configuring Network, Display and Logging Controls . . . . . . . . . . . . . . .25
Configuring Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Configuring System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Configuration after Adding/Removing Network Devices . . . . . . . . . . . .28
Using Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Chapter 4. Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Appendix A. Product Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
How to Contact McAfee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Customer service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Technical support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
McAfee training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Getting Started ix
Table of Contents

Table of Contents
x McAfee Firewall

1
Getting Started 11
1Welcome to McAfee Firewall
About McAfee Firewall
McAfee Firewall is a personal firewall that lets you monitor, control and log
your PC’s network activity. It protects you from Internet hackers and keeps
your PC private.
McAfee Firewall:
• Stops fileshare and printshare access attempts.
• Shows who is connecting (i.e., if you allow sharing)
• Stops floods and otherattack packets from being received by the Operating
System.
• Blocks untrusted applications from communicating over the network.
• Detects hidden programs ("trojans") that can give remote access to your PC
or reveal private information (e.g. online banking information).
• Provides detailed information about which sites you have contacted and
the type of connection that was made
• Blocks all traffic while you are away, and your PC is connected 24 hours a
day.
Figure 1-1. McAfee Firewall main window

Welcome to McAfee Firewall
12 McAfee Firewall
How McAfee Firewall works
McAfee Firewall is a simple-to-operate security tool for the non-technical
users. It dynamically manages your computing security behind the scenes, so
that you do not even have to understand networking protocols. It is custom
created at the moment it is needed, and only as needed, as you go on to do
something else on your computer.
McAfee Firewall filters traffic at the devices that your system uses - network
cards and modems. This means that it can reject inbound traffic before that
traffic can reach vital functions in your PC and before it can waste valuable
system resources.
It monitors applications that are either trusted or not trusted. When trusted
applications need to access a network, it manages everything in the computer
to allow that application’s traffic. When it detects non-trusted applications
trying to access a network, it blocks all traffic to and from that application.
Some network communications are needed to maintain network-based
services. These are managed through user defined rules under the SYSTEM
button feature of McAfee Firewall. The default SYSTEM settings feature
provides protection from hostile threats.
In addition, during the installation process, it will prompt you with some basic
questions to set up McAfee Firewall to do specific tasks, according to your
needs (e.g. allow sharing of files or not).
NOTE: For more information on how McAfee Firewall works, see
Chapter 3, “McAfee Firewall Configurations.”
About McAfee Firewall documentation
This Getting Started manual provides the basic information you need to
install, setup and use McAfee Firewall. More detailed information on
step-by-step instructions on how to perform a task within McAfee Firewall is
provided via the Help files which you can access while working within the
different windows and dialog boxes. You can also review the Readme.txt file
which contain other general information ( e.g., frequently asked questions)
about the product.

Getting Started 13
Welcome to McAfee Firewall
McAfee Firewall online Help
To launch McAfee Firewall help:
In the McAfee Firewall main screen, click Help menu; then select Contents.
The Help contents is displayed.
You can also search for a help topic via the Index or Find tabs.
• Index tab
1. In the text box, type the first few letters of the word or phrase you are
looking for.
2. Locate what you are looking for; then double-click the topic or click the
Display button.
• Find tab
Clicking the Find tab enables you to launch a full text search. When you
search for topics via the Find tab for the first time, a Find Setup Wizard is
displayed. Follow the instructions on screen to setup the full text search
option. After setup is complete:
1. In the text box, type the first few letters of the word or phrase you are
looking for. You can also select matching words to narrow your search.
2. Once you have located what you are looking for in the display topic box,
click the topic.
Frequently Asked Questions
The following are some frequently asked questions that you can briefly
review:
NOTE: To read additional frequently asked questions, refer to the
Readme.txt file of McAfee Firewall.
How will McAfee Firewall help me?
McAfee Firewall protects your PC at the network level. It acts as a gatekeeper,
checking every data packet going in or out of your PC. It allows only what you
tell it to allow.

Welcome to McAfee Firewall
14 McAfee Firewall
McAfee Firewall has been designed to be easy to use, while providing you
with excellent protection. Once you install and run it, it is configured to block
known attacks and to ask you before allowing applications to communicate.
How is my PC at risk on the Internet?
When you connect to the Internet, you share anetwork withmillions of people
from around the world. While that is a truly wonderful and amazing
accomplishment, it brings with it all the problems of being accessible to
complete strangers.
When on the Internet, you need to lock down your PC. When you talk to
strangers on IRC (Internet Relay Chat), be cautious of files they send you. This
is one way the BO (Back Orifice) program spreads, giving people remote
control of your PC. Check files you get for viruses.
When on the Internet, others can try to access your fileshares. You should
check that they are not available, or else people can read and delete what is on
your system.
The data you send can be seen by more people than just the intended receiver.
Practically any system that is connected to any part of the network path used
to relay your data packets can see what is sent. Also, it is hard to know with
absolute certainty that you are talking to whom you think you are talking to.
What other protection do I need?
McAfee Firewall provides network level protection. Other important types of
protection are:
• Anti-virus programs for application-level protection.
• Logon screens and screen saver passwords to prevent unauthorized access.
• File encryption or encrypting file systems to keep information secret.
• Intrusion detection for an added level of network protection.
• Boot-time passwords to stop someone else from starting your PC.
• Physical access to the computer, e.g. stealing the hard drive.
A separate but also important issue is controlling access to information,
misinformation and "filth" that is widely available on the Internet. You can use
a number of content-filtering programs or services such as McAfee’s Internet
Guard Dog that can filter the contents of data packets or restrict access to
certain sites.

Getting Started 15
Welcome to McAfee Firewall
Are there any data packets that McAfee Firewall cannot
stop?
Inbound Data: No.
As long as McAfee Firewall supports a network device and is running, it is
intercepting all incoming packets and will allow or block according to the way
you have it configured. If you choose to block everything, it will.
Outbound Data: Yes and no.
McAfee Firewall intercepts outbound data packets as they are passed to the
network device driver. All popular applications communicate this way. A
malicious program could communicate by other means, however.
What network devices does McAfee Firewall support?
McAfee Firewall supports Ethernet and Ethernet-like devices on Microsoft
Windows 95, 98 and NT 4.0 SP4 and SP5. This includes dial-up connections,
most cable and ISDN modems and most Ethernet cards. It does not support
Token Ring, FDDI, ATM, Frame Relay and other networks.
What protocols can McAfee Firewall filter?
McAfee Firewall can filter TCP/IP, UDP/IP, ICMP/IP and ARP. It intercepts
all protocols, but others, such as IPX, must be either allowed or blocked - no
filtering is done. The Internet uses the IP protocols. No others are sent. Also,
IP networks are the most common.

Welcome to McAfee Firewall
16 McAfee Firewall
How can I still be harassed, even with McAfee Firewall?
Figure 1-2. Normal TCP Connection
Many people use McAfee Firewall (and PC FIREWALL) to block the "nukes"
that cause their IRC connections to be broken (shown in Figure 1-1). While
McAfee Firewall blocks the nukes, there are other ways that attackers can still
cause the connections to be broken:
•Server-sidenuking.This is when the "nukes" aresent tothe IRC server,not
to your computer, telling the server that you can no longer be reached. To
prevent this, the IRC server needs a firewall.
•Flood blocking a TCP connection. If a flood of packets is sent to you from
a higher speed connection,McAfee Firewallor ConSeal PC FIREWALL can
stop the packets, but the flood takes up all your bandwidth. Your system
does not get a chance to send anything. Dial-up users are particularly
vulnerable since they have the lowest speed connections.

2
Getting Started 17
2Installing McAfee Firewall
Most installation problems are a caused by having programs running while
you try to install new software. Even if the installation appears normal, you
won’t be able to runthe new program. Toavoid installationproblems, close all
open programs before you install McAfee Firewall, including programs that
run in the background, such as screen savers or virus checkers.
System requirements
To use McAfee Firewall you need:
• IBM PC or compatible computer running Windows 95/98 or Windows NT.
• 5 megabytes (MB) minimum of RAM.
• 16 MB free hard disk space to install McAfee Firewall.
• Microsoft mouse or compatible pointing device.
• Access to the Internet, either a dial-up account with an Internet Service
Provider (ISP) or a constant connection through a network.
About Winsock 2
McAfee Firewall uses an API (Application Programming Interface) that is not
supported by versions of Winsock prior to v2.0. McAfee Firewall checks for
the presence of Winsock 2 during the installation procedure and will inform
you if the system does not have it. If you have the latest browser (e.g., Internet
Explorer 5), this component is already built-in and you will not receive this
prompt. Otherwise, you can get a free upgrade and is available from
http://www.microsoft.com as well as other Web sites.
NOTE: For more information on Winsock 2, refer to the Frequently
Asked Question section of McAfee Firewall’s Readme.txt file.
Installing McAfee Firewall
After closing all open programs, you are ready to install McAfee Firewall on
your PC.

Installing McAfee Firewall
18 McAfee Firewall
To install McAfee Firewall
1. Close all open programs.
2. Insert the McAfee Firewall CD in the CD-ROM drive.
3. In the McAfee Firewall Setup screen, click Install McAfee Firewall.
NOTE: If the setup screen doesn’t start automatically when you
close your CD-ROM drive, click Start on the Windows taskbar, click
Run, then typed:\setup. If D is not the drive letter of yourCD-ROM
drive, substitute the correct drive letter.
Troubleshooting installation problems
A failed installation can cause software problems that are difficult to track
down. The major causes of installation failure are:
• Hard drive errors
• Temporary files that conflict with the installation
• Attempting to install while other software is running
Follow the procedure outlined below to minimize the affect that these
common conditions may have on your installation.
Step 1: Clean up your hard drive
Run the Windows 95 hard drive utilities, ScanDisk and Disk Defragmenter to
identify and fix any errors on your hard drive:
1. Click Start onthe Windows taskbar,point to Programs, then Accessories,
then System Tools, and click ScanDisk.
2. In the ScanDisk window, select Standard and Automatically fix errors.
NOTE: These are the default settings.
3. Click Advanced. In the Advanced Settings dialog box, make sure the
following settings are selected:
• Only if errors found
•Replacelog

Getting Started 19
Installing McAfee Firewall
• Delete
•Free
4. Ignore the other options, and click OK. Click Start. ScanDisk begins
scanning your drive for errors. Depending on the size of your hard drive,
ScanDisk may take several minutes to complete its job.
5. When ScanDisk is finished, close ScanDisk.
6. Click Start onthe Windows taskbar,point to Programs, then Accessories,
then System Tools, and click Disk Defragmenter.
7. Click OK to start Disk Defragmenter. Depending on the speed of your
computer and the size of your drive, this may take several minutes to
complete.
8. Close Disk Defragmenter when it has finished defragmenting your disk.
Step 2: Remove temporary files
Delete the contents of the Windows Temp folder:
1. Double-click the My Computer icon on your desktop. The My Computer
window opens. Double-click the C: drive. You are now viewing the
contents of your hard drive.
2. Double-click the Windows folder.
3. In the Windows folder, double-click the Temp folder.
4. In the menu, click Edit,then click Select All. All of the items in your Temp
folder are highlighted.
5. Press the Delete key on your keyboard to delete the files. If Windows
asks about deleting files, click Yes.
6. In the Windows taskbar, click Start, then click Shut Down.
7. Click Restart the computer, then click Yes in the Shut Down Windows
dialog box to restart your PC.
Step 3: Close other software
Disable all software running in the background:
1. Hold down the Ctrl and Alt keys on your keyboard, and then press the
Delete key once. The Close Program dialog box appears.
2. Click End Task for every item on the list except Explorer.

Installing McAfee Firewall
20 McAfee Firewall
3. Repeat steps 2 and 3 until you’ve closed everything except Explorer.
4. When you see only Explorer in the Close Program dialog box, click
Cancel.
You are now ready to install your new software.