The firewall just passes these requests through without question.
Enable the firewall??”Select the Enable option for the system to set up a basic set of
iptables firewall rules for you, without your having to figure out how iptables works.
Once your firewall is enabled, you can choose to allow selected services to your Linux
system using those listed in the Service column.
Select trusted services??”If you are offering access to services from your system, select
the check box next to the service you want to allow. You can enable access to the listed
server types from your system by selecting the appropriate check boxes.
Open other ports??”To allow access to other ports (which represent particular services),
click the arrow next to the Other Ports heading. Click Add, and then type either the port
name (such as imap) or number (such as 143) and select the protocol (TCP or UDP).
Open your IMAP and POP3 ports only if your computer is a mail server. If you??™re just
downloading and reading mail from your computer, you can get your mail just fine from
an IMAP or POP3 server without opening those ports.
After you have saved your firewall rules, you can examine the /etc/sysconfig/iptables file to
see the firewall rules you created from your selections on the Firewall Configuration window.
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