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7.7 Network Services
This group contains tools to configure all kinds of services in the
network. These include name resolution, user
authentication, and file services.
7.7.1 Mail Transfer Agent
You can configure your mail settings in if you send your e-mail with
sendmail, postfix, or the SMTP server of your provider. You can fetch mail
via the fetchmail program, for which you can also enter the details of
the POP3 or IMAP server of your provider. Alternatively, use a mail program
of your choice, such as KMail or Evolution, to set your access
data. In
this case, you do not need this module.
To configure your mail with YaST, specify the type of your connection
to the Internet in the first dialog.
Choose one of the following options:
-
-
Select this option if you have a dedicated line to the Internet. Your
machine is online permanently, so no dial-up is required. If your
system is part of a local network with a central e-mail server,
select this option to ensure permanent access to your e-mail
messages.
-
-
This item is relevant for users who have a computer at home, are not
located in a network, and occasionally connect to the Internet.
-
If you do not have access to the Internet and are not located in a
network, you cannot send or receive e-mail.
Activate virus scanning for your incoming and
outgoing e-mail with AMaViS by selecting that option.
The package is installed automatically as soon as you activate the
mail filtering feature. In the following dialogs, specify the outgoing
mail server (usually the SMTP server of your provider) and the parameters
for incoming mail. Set the diverse POP
or IMAP servers for mail reception by various users. Using this dialog,
you can also assign aliases, use masquerading, or set up virtual domains.
Click to exit the mail configuration.
7.7.2 Mail Server
IMPORTANT: LDAP-Based Mail Server Configuration
The mail server module of SUSE Linux Enterprise Server only works if the users, groups, and
the DNS and DHCP services are managed with LDAP.
The mail server module allows configuration of SUSE Linux Enterprise Server as a mail server.
YaST assists with the following steps of the configuration process:
- Global Settings
-
Configures the identification of the local mail server and the
maximum size of incoming or outgoing messages and the type of mail
transport.
- Local Delivery
-
Configures the type of local mail delivery.
- Mail Transport
-
Configures special transport routes for mail depending on its target
address.
- SPAM Prevention
-
Configures the SPAM protection settings of the mail server. This
activates the tool AMaViS. Set up the type
and strictness of the SPAM check.
- Mail Server Relaying
-
Determines from which networks the mail server cannot be used for
sending nonlocal mail.
- Fetching Mail
-
Configures mail pick-up from external mail accounts over various
protocols.
- Mail Server Domains
-
This determines for which domains the mail server should be
responsible. At least one master domain must be configured if the
server should not run as a null client used exclusively for sending
mail without receiving any.
Distinguish among three domain types:
- main
-
Main or master domain of the local mail server
- local
-
All users who can receive mail in a master domain can also receive
mail in a local domain. In the case of a message within the local
domain, only the portion before the @ is
evaluated.
- virtual
-
Only users with an explicit address within a virtual domain
receive mail. Virtual mail addresses are set up in the user
management module of YaST.
7.7.3 Other Available Services
Many other network modules are available in YaST .
- DHCP Server
-
Use this to set up a custom DHCP server in only a few steps.
Section 35.0,
DHCP provides basic knowledge
about the subject and a step-by-step description of the
configuration process.
- DNS Server
-
Configuring a DNS server that is responsible for name
resolution is recommended for larger networks. You can use for this as
described in Section 34.2,
Configuration with YaST. Section 34.0,
The Domain Name System
provides background information about DNS.
- DNS and Hostname
-
Use this module to configure the hostname and DNS if these settings
were not already made while configuring the network devices.
Also use it to change the hostname and domain name. If the provider has
been configured correctly for DSL, modem, or ISDN access, the list of
name servers contains the entries that were extracted automatically from
the provider data. If you are located in a local network, you might
receive your hostname via DHCP, in which case you should not modify the
name.
- HTTP Server
-
To run your own Web server, configure Apache in . Find more information
in Section 41.0,
The Apache HTTP Server.
- Hostnames
-
When booting and in small networks, you can use
for hostname resolution instead of DNS. The
entries in this module reflect
the data of the file /etc/hosts. For more
information, read
/etc/hosts
.
- Kerberos Client
-
If you have a Kerberos server in your network for network
authentication, use . A detailed description
of the client configuration with YaST
is available in Section 47.6,
Configuring a Kerberos Client with YaST.
- LDAP Client
-
If using LDAP for user authentication in the network, configure the
client in . Information
about LDAP and a detailed description of the client configuration with
YaST
are available in Section 37.6,
Configuring an LDAP Client with YaST.
- LDAP Server
-
The LDAP server can keep various data in a central directory and
distribute it to all clients in your network. Mostly it is used
to store shared contact information but its function is not limited
to that. An LDAP server can be used also for authentication.
Information about LDAP and a detailed description of the server
configuration with YaST are available in Section 37.0,
LDAP—A Directory Service.
- NFS Client
-
With NFS client, mount directories provided by NFS
server in your own file trees. Use
to configure your system to
access an NFS server in the network. A description of the YaST module
and background information about NFS are provided in
Section 39.0,
Sharing File Systems with NFS.
- NFS Server
-
With NFS, run a file server that all members of your network
can access. This file server can be used to make certain applications,
files, and storage space available to users. In , you can configure your host as an NFS server
and determine the directories to export for general use by the network
users. All users with the appropriate permissions can mount these
directories in their own file trees. A description of the YaST module
and background information about NFS are provided in
Section 39.0,
Sharing File Systems with NFS.
- NIS Client
-
If you run NIS server to administer user data on a
central place and distribute it to the clients, configure the client
here. Detailed information
about NIS client and configuration with YaST is available in
Section 36.2,
Configuring NIS Clients.
- NIS Server
-
If you run more than one system, local user administration (using the
files /etc/passwd and
/etc/shadow) is impractical and requires a lot of
maintenance. In this case, administer user data on a
central server and distribute it to the clients from there. NIS
is one option for this. Detailed information
about NIS and its configuration with YaST is available in
Section 36.1.1,
Configuring a NIS Master Server.
- NTP Client
-
NTP (network time protocol) is a protocol for synchronizing hardware
clocks over a network. Information about NTP and instructions for
configuring it
with YaST are available in Section 33.0,
Time Synchronization with NTP.
- Network Services (xinetd)
-
Configure the network services (such as
finger, talk, and ftp) to start when SUSE Linux Enterprise boots using
. These
services enable external hosts to connect to your computer. Various
parameters can be configured for every service. By default, the master
service that manages the individual services (inetd or xinetd) is not
started.
When this module starts, choose whether to start inetd or xinetd.
The selected daemon can be started with a standard selection of
services. Alternatively, compose your own selection of services with
, , and
.
WARNING: Configuring Network Services (xinetd)
The composition and adjustment of network services on a system is a
complex procedure that requires a comprehensive understanding of the
concept of Linux services. The default settings are usually sufficient.
- Proxy
-
Configure Internet proxy client settings in
. Click
then enter the desired proxy settings.
You can test these settings by clicking .
A small window informs you whether your proxy settings work correctly.
After your settings have been entered and tested, save them by clicking
.
- Remote Administration
-
To administer your machine remotely from another
machine, use . To maintain your
system remotely, use a VNC client, such as
krdc, or a Java-enabled browser. Although remote administration using VNC
is simple and
fast, it is less secure than using SSH, so you should always keep this
in mind when using a VNC server. Find detailed information about
installing with a VNC client in Section 4.1.1,
Simple Remote Installation via VNC—Static Network
Configuration.
Allow remote administration by selecting
in . Selecting
disables this
function.
Click to allow access to your
computer. Clicking
displays network interfaces with
open ports in the
firewall. Select the desired interface and click
to return to the
main dialog. Click to complete the
configuration.
The YaST module is highly
recommended for configuring VNC on
your machine. Although the SaX2
interface also allows you to set remote access properties, it is not a
substitute for
YaST. It only enables you to configure your X server as a host for VNC
sessions. For more information,
refer to Section 7.13.6,
Remote Access Properties.
- Routing
-
Use to configure the paths data takes
over the network. In most cases, only enter the IP address of the
system through which to send all data in . To create more complicated configurations, use
.
- Samba Server
-
In a heterogeneous network consisting of Linux and Windows hosts,
Samba controls the communication between the two worlds. Information
about Samba and the
configuration of servers is provided in Section 38.0,
Samba.
- SLP Server
-
With service location protocol (SLP), you can
configure clients in your network without knowledge of
server names and services that these servers provide. Detailed
information
about SLP servers and configuration with YaST are described
in Section 32.0,
SLP Services in the Network.
- TFTP Server
-
A TFTP server in not an FTP server. While an FTP server uses the File
Transfer Protocol (FTP), a TFTP server uses the
much simpler Trivial File Transfer Protocol (TFTP) without security
features.
TFTP servers are usually used to boot diskless workstations,
X terminals, and routers.
Detailed information about TFTP servers and configuration with YaST
are described
in Section 4.3.2,
Setting Up a TFTP Server.
- WOL
- WOL (wake on LAN) refers to the possibility of waking up a
computer from
standby mode over the network using special packages. It only works with
motherboards
that support this functionality in their BIOS.
WOL configuration with YaST is described
in Section 4.3.7,
Wake on LAN.
- Windows Domain Membership
-
In a heterogeneous network consisting of Linux and Windows hosts,
Samba controls the communication between the two worlds. With
the
module, you can configure your computer as member of a Windows
domain. Find information
about Samba and the configuration of clients in Section 38.0,
Samba.
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