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SSG 500-series Installation and Configuration Guide

40  PIM Configuration

PIM Configuration

To configure the interfaces on physical interface modules (PIMs), refer to the PIM

and Mini-PIM Installation and Configuration Guide.

Basic Firewall Protections

The devices are configured with a default policy that permits workstations in the

Trust zone of your network to access any resource in the Untrust security zone,

while outside computers are not allowed to access or start sessions with your

workstations. You can configure policies that direct the device to permit outside

computers to start specific kinds of sessions with your computers. For information

about creating or modifying policies, refer to the Concepts & Examples ScreenOS

Reference Guide.

SSG 500-series devices provide various detection methods and defense

mechanisms to combat probes and attacks aimed at compromising or harming a

network or network resource:

 ScreenOS Screen options secure a zone by inspecting, and then allowing or

denying, all connection attempts that require crossing an interface to that zone.

For example, you can apply port-scan protection on the Untrust zone to stop a

source from a remote network from trying to identify services to target for

further attacks.

 The device applies firewall policies, which can contain content filtering and

Intrusion Detection and Prevention (IDP) components, to the traffic that passes

the Screen filters from one zone to another. By default, no traffic is permitted to

pass through the device from one zone to another. To permit traffic to cross the

device from one zone to another, you must create a policy that overrides the

default behavior.

To set ScreenOS Screen options for a zone:

WebUI

Screening > Screen: Select the zone to which the options apply. Select the

Screen options that you want, then click Apply:

CLI

set zone zone screen option

save

For more information about configuring the network security options available in

ScreenOS, refer to the Attack Detection and Defense Mechanisms volume of the

Concepts & Examples ScreenOS Reference Guide.

Verifying External Connectivity

To verify that workstations in your network can access resources on the Internet,

start a browser from any workstation in the network and browse to

www.juniper.net/

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Secure Computing SG550 Spécifications Page 40

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