Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Scaricare il pdf (Pagina 234)

234 Useful tools for Red Hat Enterprise Linux WS 4

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INDEX

15.2 Firewall configuration

RED HAT ENTERPRISE LINUX WS 4 has a firewall package inside. You can activate

and configure it during installation (see chapter 9.1) or in the running system.

Note that for acquisition the ethernet card for spectrometer control has not to be

restricted by the firewall! For this it is strongly recommended to free the ethernet

card after activating the firewall (see below)!

The rules for the firewall, checked and executed during boot time, are stored in the

file

: /etc/sysconfig/iptables-config

The rules in this file are:

• defined during installation (see chapter 9.1)

• added manually (see troubleshooting, chapter 12.3.1.2)

• added manually by using a graphical user interface (see the next chapter)

15.2.1 Firewall configuration

RED HAT ENTERPRISE LINUX WS 4 offers a graphical user interface that allows

you to define some firewall configurations. The following example describes a

firewall configuration that allows SSH traffic on eth0 and frees eth1 completely.

1. Open a Linux shell

2. Become superuser

• su -

• enter superuser password

3. Type in

• redhat-config-securitylevel

or click on

• SystemSettings → Security level

1. In RED HAT ENTERPRISE LINUX WS 4 there is also another possibility for the firewall

settings: /etc/sysconfig/iptables

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Red Hat ENTERPRISE LINUX WS 2.1 - Guida di Installazione Pagina 234