CyberGuard SG570 manuels

Cyberguard SG570 Guide d'installation (44 pages)

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Table des matières

Firewall Tutorial

1

Acknowledgements

3

INTRODUCTION

4

About this tutorial

4

What is a firewall?

4

Why do you need them?

4

Security breaches cost you

5

Other security measures

6

Find out what your ISP offers

6

Basic networking principles

9

Different firewall scenarios

11

Simple versus sophisticated

14

How NAT works

14

Packet filters

15

Stateful packet filters

15

Application proxies

16

Subnetworks

18

Subnet masks

18

DHCP servers

19

What are ports?

20

STEP 10: DIY security audit

26

Online testing facilities

26

Security audit software

26

Prepare your test scenario

30

Run the test

31

 can you browse the web?

37

Failover/load balancing

40

Dual WAN ports

41

Load balancing

41

GLOSSARY

42

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