CyberGuard SG570 Instalační příručka stáhnout pdf (Strana 8)

STEP 1: Understanding firewalls in principle

• A firewall is a means of shielding your private computer system from an untrusted network,

like the Internet.

• Any outside connection puts your network at some risk, and should be regarded as gateways

to an untrusted network, whether or not it is in use. Some standard computer services

increase this risk by running less than secure IP protocols such as FTP (File Transfer

Protocol) and UDP (User Datagram Protocol).

• Firewalls mediate network traffic to allow authorised traffic and bar unauthorised or risky

traffic.

• However, your firewall cannot completely shield you from the outside, as you may want to

browse the Internet, send and receive emails etc. For that purpose, your firewall needs to

open some doors for traffic between the networks. Step 7, the section on

understanding ports and configuration explains which doors are safe to open and how to

safely open and close such doors.

• There is no point in establishing a connection to another network if you do not use it.

• If your private network is not connected to any other network, you do not need a firewall.

Understanding that firewalls have limits

• Firewalls are not the panacea of computer security.

• Firewalls are one important tool to secure your network, but are not going to solve all your

security problems. They are an essential ingredient in your total IT security strategy, but

cannot be the only one.

• In particular, firewalls offer only limited protection from attacks originating from within your

private network. They will not prevent you from opening dangerous attachments to emails,

or downloading unsafe applications.

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CyberGuard SG570 Instalační příručka Strana 8