/usr/share/doc/system-config-kickstart/system-config-kickstart-firewall.html is in system-config-kickstart 2.5.20-0ubuntu22.
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>Chapter 8. Firewall Configuration</H1
><P
> The <B
CLASS="GUILABEL"
>Firewall Configuration</B
> window is similar to the
screen in the installation program and the
<B
CLASS="APPLICATION"
>Security Level Configuration Tool</B
>.
</P
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><P
><B
>Figure 8-1. Firewall Configuration</B
></P
></DIV
<P
> If <B
CLASS="GUILABEL"
>Disable firewall</B
> is selected, the system allows
complete access to any active services and ports. No connections to the
system are refused or denied.
</P
><P
> Selecting <B
CLASS="GUILABEL"
>Enable firewall</B
> configures the system to
reject incoming connections that are not in response to outbound
requests, such as DNS replies or DHCP requests. If access to services
running on this machine is needed, you can choose to allow specific
services through the firewall.</P
><P
> Only devices configured in the <B
CLASS="GUILABEL"
>Network
Configuration</B
> section are listed as available
<B
CLASS="GUILABEL"
>Trusted devices</B
>. Connections from any devices
selected in the list are accepted by the system. For example, if
<B
CLASS="GUILABEL"
>eth1</B
> only receives connections from internal
system, you might want to allow connections from it.
</P
><P
> If a service is selected in the <B
CLASS="GUILABEL"
>Trusted services</B
>
list, connections for the service are accepted and processed by the
system.
</P
><P
> In the <B
CLASS="GUILABEL"
>Other ports</B
> text field, list any additional
ports that should be opened for remote access. Use the following format:
<TT
CLASS="USERINPUT"
><B
>port:protocol</B
></TT
>. For example, to allow IMAP access
through the firewall, specify <TT
CLASS="USERINPUT"
><B
>imap:tcp</B
></TT
>. Specify
numeric ports can also be specified; to allow UDP packets on port 1234
through the firewall, enter <TT
CLASS="USERINPUT"
><B
>1234:udp</B
></TT
>. To specify
multiple ports, separate them with commas.
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