Red Hat ENTERPRISE LINUX 4 - INSTALLATION GUIDE FOR IBM S-390 AND IBM ESERVER ZSERIES Installation Manual page 44

Chapter 2. Installing Red Hat Enterprise Linux
Enabling these options allow the specified services to pass through the firewall. Note, these
services may not be installed on the system by default. Make sure you choose to enable any
options that you may need.
Remote Login (SSH)
Secure Shell (SSH) is a suite of tools for logging in to and executing commands on a
remote machine. If you plan to use SSH tools to access your machine through a firewall,
enable this option. You need to have the
access your machine remotely, using SSH tools.
Web Server (HTTP, HTTPS)
The HTTP and HTTPS protocols are used by Apache (and by other Web servers) to serve
webpages. If you plan on making your Web server publicly available, enable this option.
This option is not required for viewing pages locally or for developing webpages. You must
install the package if you want to serve webpages.
httpd
File Transfer (FTP)
The FTP protocol is used to transfer files between machines on a network. If you plan on
making your FTP server publicly available, enable this option. You must install the
package in order to publicly serve files.
Mail Server (SMTP)
If you want to allow incoming mail delivery through your firewall, so that remote hosts can
connect directly to your machine to deliver mail, enable this option. You do not need to
enable this if you collect your mail from your Internet Service Provider's server using POP3
or IMAP, or if you use a tool such as
server can allow remote machines to use your server to send spam.
Note
By default, the Sendmail mail transport agent (MTA) does not accept network
connections from any host other than the local computer. To configure Sendmail
as a server for other clients, you must edit
the DAEMON_OPTIONS line to also listen on network devices (or comment out
this option entirely using the
/etc/mail/sendmail.cf
make -C /etc/mail
You must have the
Additionally, you can now setup SELinux (Security Enhanced Linux) during your installation of
Red Hat Enterprise Linux.
34
openssh-server
. Note that an improperly configured SMTP
fetchmail
comment delimiter). You must then regenerate
dnl
by running the following command (as root):
package installed for this to work.
sendmail-cf
package installed in order to
/etc/mail/sendmail.mc
vsftpd
and change