SME Server:Documentation:Administration Manual:Chapter5

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Installing And Configuring Your SME Server Software

The following sections explain in detail the process of installing the SME Server software.


Important.png Note:
If you have previously installed and configured a server and are reinstalling the software, please be aware that you should use the procedure described in section 5.3. Upgrading From A Previous Version in order to preserve your existing configuration and data. Simply performing a new installation will erase all previously existing user accounts, user directories, i-bay contents and web site and configuration parameters. If you have not already done so, you may wish to back up the contents of your server onto one of your desktop computers. You can do so easily by selecting "Backup or restore" from the server manager, as explained in chapter 10.1.

Licensing Terms and Conditions

In installing the SME Server software, you are agreeing to the open source licensing terms and conditions associated with it. You can read these terms and conditions in|Chapter 1.2. of this guide under the title Software Licensing Terms and Conditions .

RAID1 Support (Disk Mirroring)

With SME Server, you have the ability to set up disk mirroring, also called RAID Level 1. In disk mirroring, you basically write all of your data to two separate hard disks installed in your server. One is the mirror of the other. Should the primary disk experience a hardware failure, the mirror disk will continue operations as if nothing had happened. All of your data will be protected.

Disk mirroring can be accomplished through either software or hardware .

Software Mirroring

The SME Server comes by default with RAID disk mirroring. The level of Raid depends on the number of drives installed. The server is configured to accept any number of drives and will function properly. You can verify the RAID status from the console. If you later wish to add more drives, just add them and instruct the server via the console to create the mirror. It will take some time to build so do it during scheduled maintenance. They can be either SCSI or IDE drives, but we strongly advise they are the same size and type.

There is more technical information on SME Raid at http://wiki.contribs.org/Raid


Important.png Note:
SME Server 9 differs from SME server 8.1 in that the default install will only configure a Raid 1 configuration regardless of the number of hard drives available. There are selectable install options for other Raid configurations available from the install menu when sufficient hard drives are installed to support that Raid config

Hardware Mirroring

With hardware mirroring, you use a special RAID disk controller to perform the actual mirroring across multiple disks. As mirroring is performed in hardware, the performance can be significantly faster than software mirroring. Additionally it can simplify configuration because to the operating system the entire RAID disk system looks like one single disk. You should be able to use any supported SCSI hardware RAID controller.

If you are going to use hardware mirroring, you should NOT choose Install - Dual hard disk with software RAID-1 mirroring during the installation process described in section 5.4. Installing the Software. (Doing so will enable software mirroring.) Instead, you should do a regular installation of the software. See Booting


Important.png Note:
Using one of the supported hardware RAID controllers, you will be able to upgrade from an earlier version of the SME Server to version 6.x using the standard upgrade process detailed in section 5.3. Upgrading From A Previous Version. You should back up all your data and test carefully after installation.

Upgrading From A Previous Version

Upgrade from 8.x to 9.x
Important.png Note:
In-place upgrades to SME 9.x using yum or CD are not supported due to design constraints imposed by CentOS.

It is necessary to backup the old server & then restore to the new server. Contribs will need to be reinstalled.


The simplest way to do this is via a Console Backup to attached USB disk on the old server. Alternatively use one of the Backup & Restore options available in server manager panel, ie backup to desktop, or backup to workstation (either to attached USB or network share). Other non standard options exist to Backup virtual servers that do not have USB ports etc, & Restore to similar virtual systems, eg using ssh.


Information.png Tip:
The Restore from USB on first boot function (on a newly installed SME 9 server), will only utilise backups that are saved as smeserver.tgz files, which are the Console backup to USB or the server manager backup to Desktop. The server manager backup to Workstation (either to USB or network share) creates a "backupdate.dar" type filename (or multiple split parts) & cannot be used to restore using the Restore on first boot function, it can only be used for restores from server manager. The new install must have its backup to workstation configured as per the old install.

Upgrade via Console backup to USB drive
  • Log in as admin & Backup the old server via a Console Backup to attached USB disk. This may take many hours if you have a lot of data on your server, depending on USB port speed, USB drive speed, & types of files being backed up ie whether already compressed or not etc. Typically for 250Gb of data on your server hard drive, 2 to 4 hours.
  • Install the SME 9.x OS from CD on the new hardware (on new server).
  • Select to do a Restore on first boot of the newly installed SME Server 9. Only attach USB containing the backup file, when asked on first reboot. Restore may take a few hours depending on data size etc. Make sure you wait for the Restore complete message.
Upgrade via server manager backup to Desktop or Workstation (USB or network)
  • On the old server in server manager, configure the required backup in the Backup or Restore panel. Schedule the backup to run at a suitable time. This backup can be to a workstation desktop for systems with a smaller amount of data, which creates a smeserver.tgz backup file, or to a locally connected USB drive or to a network share, & creates xx...xx.dar files, split into multiple parts if configured & data size is large. This may take many hours to run depending on data size etc.
  • On the new SME9 server, manually configure the identical backup job in the server manager Backup or Restore panel. The backup job MUST point to the exact same location that the original backup file is saved to.
  • Select the Restore function within server manager & select the full backup you want to restore from. This may take many hours to run depending on data size, network speed etc. Make sure you wait for the Restore complete message.
  • Basic networking configuration of the new and/or restored SME9 server will be required if different from original server.
Upgrade using command line restore via ssh or USB
  • It is possible to use the command line to transfer a backup file via ssh (or USB) to the new server & then to run the restore. Standard & non standard backup concepts & procedures are outlined in the Backup server config Howto, http://wiki.contribs.org/Backup_server_config If using any non standard method, then the integrity of your SME server data cannot be guaranteed.
  • To do a standard backup & restore using CLI, on the old server log in as admin & perform the Console Backup to USB drive (to a locally connected USB). Alternatively using suitable commands, a smeserver.tgz backup file could be created & saved to / folder, refer Howto.
  • Install the SME 9.x OS from CD on the new hardware (on new server).
  • Answer No when asked if you want to restore from USB during the first boot.
  • If you created or have the backup file on the old server, transfer the smeserver.tgz backup file via ssh from your old server to your new server. Both servers must be connected & remote access enabled
  • On the old server do:
scp -P zzzz /smeserver.tgz newserverIP:/

(where zzzz = port number)

  • If you saved the backup file to USB, then transfer the smeserver.tgz backup file from USB to your new server
  • Log in as root or a root user on the new server & do:
mount /media/usbdisk
cp /media/usbdisk/Backup-date-folder/smeserver.tgz /

(replace usbdisk with actual mount point name & Backup-date-folder with actual folder date name)

  • After the backup file has been copied to the new server, on the new server do:
cd /
signal-event pre-restore
tar -C / -xzvf smeserver.tgz
/sbin/e-smith/signal-event post-upgrade
/sbin/e-smith/signal-event reboot
  • Before restarting the new server, disconnect old server from network (as you will have clashes due to duplicate IPs)
  • On new server do:
cd /
rm smeserver.tgz
  • Note the backup & restore may take many hours to complete depending on data size etc.
  • After restore, the Configuration of the new server should be identical to the old server.
  • Note with two servers connected during ssh copying operations, basic networking configuration of the new unrestored SME9 server will need to be temporarily different to the old server to avoid clashes
Reinstall Contribs after restore

Add on contrib rpm packages will need to be re-installed on the new SME 9.x server as these are NOT included in the backup. Contrib data & configuration is included in backups & will be restored, but its usefulness will depend on the contrib design being unchanged between older (SME7/el4 or SME8/el5) & SME9/el6 package versions.

Delete & Reconfigure Manual tweaks

Other manual tweaks eg custom templates or scripts, will need to be deleted & recreated in line with SME 9.x template code & base code.

Where extensive modifications have been made to the "old server (eg SME8.1)", it is recommended to carry out a test backup & restore upgrade first, to discover any problems & ascertain suitable fixes & workarounds. Removing contribs & custom templates before upgrading is recommended.

Upgrade from 7.x to 8.x

If you have previously installed a server and now wish to upgrade to a later version, you can do so while preserving your configuration data. To do so, select Upgrade from the appropriate screen in the installation process as described in section 5.4. Installing the Software.

While the upgrade should proceed smoothly, we do recommend that you back up your system prior to performing this upgrade just to be safe. Also see the related Howto UpgradeDisk if you are restoring to a new server or new Drive.

Bugzilla: 6732 and Bugzilla: 7056

Warning.png Warning:
Before performing an upgrade to SME 8 from version 7.xx you need to fully update the installation of version 7.xx before attempting the upgrade.


Warning.png Warning:
It is not possible to use the Upgrade option to add software mirroring (RAID1) to an existing server.


If you previously installed software mirroring with a previous version of the software, you should be able to upgrade without any problems. However, if you want to upgrade a previous version of the software that was not installed with software mirroring to use software mirroring (RAID1) support, you should:

 1. perform a backup through the server manager as detailed in chapter 10.1. Backup or restore
2. perform a fresh install selecting the software mirroring option
3. restore the backup through the server manager

Installing the Software

bugzilla: 6702

Important.png Note:
With some later generation motherboards you may need to set SATA AHCI mode to AHCI instead of IDE in the Bios to enable the installation to commence and complete.

When booting from the installation CD you will get a boot prompt where you can simply press Enter to start the standard installation (or upgrade) routine.


Information.png Tip:
You have some command Line Options that you can use to set some parameters as LVM (activated by default), software Raid option (none,0,1,5,6).You can use the function keys F1 to F5 to get more information about different boot options. see Booting


Important.png Note:
When installing SME Server using custom RAID boot options, one must make sure you enter the correct number of drives. If the installer detects a mismatch between the user entered number of drives and the real number of drives, the installation will result in error messages and will fail. See below bugzilla report.

bugzilla:7529

After showing the boot prompt for some time SME will start the installation process automatically. It will then afford you the opportunity to test the installation medium.

Afterwards you can choose which language you want to use for the following installation process.

bugzilla: 6401

Important.png Note:
If your cdrom is set as hda then the following error message may appear in the console during startup: "Setting up Logical Volume Management: /dev/hda: open failed: No medium found 2 logical volumes(s) in volume group "main" now active"

Bugzilla: 6996

Important.png Note:
Hardware that may include an internal tape drive may experience a Installer fail immediately after cd check or skipping cd check, see disconnect the tape drive retry install again


Important.png Note:
If you are configuring your system with RAID1 support, notice that your step 4 below will be slightly different. If you skipped section 5.2 RAID1 Support (Disk Mirroring), it would be advisable to read it before proceeding.

Step 1: Insert the CD-ROM media.

Step 2: You will be given the option of testing the CD --ROM-- media before beginning installation. Choose OK to test the CD media or choose Skip to start the installation.

000.png

Step 3: Select the language you would like to use during the installation process.

005.png

Step 4: Select which model keyboard is attached to your computer.

006.png

Step 5: You are informed that all disks will be formatted and any data will be lost. You must choose Yes to proceed.


Warning.png Warning:
The installation process formats and erases all attached hard drives. USB hard drives are considered non-removable drives. Removable drives are USB pen drives and floppy/cd rom drives. The installer ignores all removable drives and uses all non-removable drives that are at least 2Gb in size.

If you have multiple hard drives, be sure to back them up prior to starting the installation process. Be sure to unplug USB drives.



008.png

Step 6: Select which time zone you are in. The installation process will now automatically proceed to install the necessary packages.

009.png

Step 7: Finishing the installation is automatic and takes only a few minutes. At the end of the process, you will be prompted to remove the CD and then to reboot your computer.

019.png


Warning.png Warning:
The installation (or upgrade) process rewrites the boot sector on your hard drive. This may cause machines with BIOS boot sector virus detection to not boot unattended. This detection should be disabled in your system's BIOS.

Restoring a Backup

If you have a tar backup (usually smeserver.tgz) you are prompted if you wish to restore. Enter your media, CD, DVD, USB Disk or Tape drive

If you have a DAR backup perform your restore from the server-manager after configuration.

Configuring your SME Server

Information.png Tip:
To change configuration settings, you have set during install, at a later date you can login as admin user to your server console and choose the option to Reconfigure your server. You will be take through the configuration routine just like during installation. Make your necessary changes or use the Keep option to preserve the settings you have set previously.

Once your system has restarted (so that it is no longer booting from the installation CD), you are ready to configure your system.

If your ISP provided you with a summary of your configuration choices and network information, we suggest that you keep it handy while completing the screens in the configuration section of the server console.

There are several types of configuration parameters that must be entered into your server:

  • the system password
  • the type of ethernet adapters (network interface cards, or NICs) that will be used by your server to communicate with the internal network and the Internet (or external network). Typically, the server software will detect this information automatically. (Note that if you are connecting to the Internet with a dialup connection, you only need one ethernet adapter.)
  • configuration for the internal (local) network - you must provide information about your internal network so that your server can communicate with other machines on your local network.
  • operation mode - you must select whether your server will operate in server and gateway mode or server-only mode.
  • configuration for the external network/Internet - you must configure your server so that it can communicate with your ISP either by a dedicated connection or using a dialup connection (only for server and gateway mode).
  • miscellaneous information - there are several final items to configure, such as whether to allow your users to use a proxy server, whether to provide status reporting to Contribs.org, and whether you wish to secure the server console so that it can only be accessed using the administrator's password.

As you select a given configuration parameter, you will be presented only with the screens necessary for your given configuration. Each screen will provide you with a simple, detailed explanation of the required information.


Important.png Note:
As you move through the configuration screens, you will notice that there is a "Keep" option which will allow you to keep the choices you may have made previously. Obviously, when you are configuring your system for the first time, many of these choices will not have been made, but if you later go back to re-configure the system, this option can save time.

Setting Your Administrator Password

As shown in the image below, the first thing you will be asked to do is to set the system password. This is the password you will enter to access the web-based server manager. Depending on how you configure the system, you may also need to enter this password to access the server console. It is extremely important that you choose a good password and keep that password secret.

Anyone who gains access to this password has the power to make any change to your server!

5.6 setting your admin password.png

After you enter the password once, you will be asked to type it again to confirm that the password was recorded correctly. The password will also be examined to determine how strong it is from a security point-of-view. If it is found to be weak (for instance, a dictionary word), you will see an additional screen asking if you really want to use this password. You will have the option to go back and change to a stronger password or to continue using the weaker password.


Warning.png Warning:
You can use any ASCII printable characters in the administrator password. As this password gives someone total control over your server, you should choose a password that cannot be guessed easily. A good password should contain mixed upper- and lower-case letters, numbers and punctuation, yet also be easy to remember. An example might be "IwmSMES!" as in "I want my SME Server!" (Please don't use this example as your password!)

Configuring Your System Name and Domain Name

As shown below, your next step is to enter the primary domain name that will be associated with your SME Server. (You can later configure other virtual domains that work with the server.)

Set primary domain name.png

Next you need to provide a name for your server. You should think carefully about this as changing it later may create additional work. (For instance, Windows client computers may be mapping drives to your server using its name. Those clients would need to remap the drive using the new name.)


Information.png Tip:
You should make the system name as unique as possible in case you someday decide to link your server to another server using an IPSEC VPN. When you do, each server will need a unique name. Using some type of theme, such as location names, may be an effective way to ensure unique names.

Select system name.png

Configuring Your Local Network

Selecting Your Local Ethernet Adapter

An ethernet adapter - also called an ethernet card or network interface card (NIC) - is a special piece of hardware that serves as the interface between a computer and the ethernet network. It connects your computer and the ethernet, allowing the computer to communicate with other computers and devices on the network.

A computer needs a special software program, called an "ethernet driver", to use an ethernet adapter. Which ethernet driver is required depends on which ethernet adapter is installed on your computer.

You will first need to select the appropriate driver for the ethernet adapter connected to your local network, a shown in the screen below:

Select local enet driver.png

If you are using a PCI ethernet adapter that appears on our supported list, it is likely that your server will be able to detect your hardware automatically and you will simply be able to choose option 1, "Use xxxx (for chipset yyyy)", where 'xxxx' and 'yyyy' are specific to your hardware. If the software fails to detect it correctly, you can manually select the appropriate driver for your ethernet adapter from a list of drivers or from a list of ethernet adapter models. After the appropriate driver is selected, select "OK" and proceed to the next screen.

As of SME Server 9.1, (virtual) servers with only 1 ethernet adapter will have an additional option to select a 'Fake ethernet adapter' as Local ethernet adapter. Selecting this fake ethernet adapter as your local ethernet adapter will allow you to operate SME Server in server-gateway mode with only 1 real ethernet adapter, profiting from all the features the server-gateway operation mode provides, such as security features and firewall (See below 'operation mode'). The fake ethernet adapter will be used as your local ethernet adapter and the real network card will be used as the WAN interface. This is especially useful for (virtual, hosted or cloud) SME Sever installations with providers that only provide 1 physical network interface with a virtual server offering (VPS).

Configuring Local Network Parameters

Your SME Server needs information about your local network in order to communicate with the other computers on your network. This includes the IP address and the subnet mask on your server's internal interface. Because your server acts as a gateway and firewall, these will differ from the IP address and subnet mask on the external interface.


Warning.png Warning:
If you configure your server in server-gateway mode make sure the IP address for the internal interface and the one for the external interface are in different ranges that do not overlap.

If you plan to operate in server and gateway mode (explained in greater detail below), your server will act as a relay between your local network and the Internet. Because no computer on your local network, other than your server, directly interacts with the external world, the IP addresses assigned to those computers need only be unique with regards to your local network. (It doesn't matter if a computer on someone else's local network uses the same IP address, because the two machines will not be in direct contact.) As a result, we are able to use special "non-routable IP addresses" for your local network, including the internal interface of your server.

Select local network.png

If you have no reason to prefer one set of IP addresses over another for your local network, your server will prompt you with default parameters that are probably appropriate in your situation.


Information.png Tip:
If you are installing servers at multiple sites within your organization, you may find it useful for later troubleshooting to use different network addresses for each site. Additionally, if you ever want to establish an IPSEC VPN between the servers, each server will need to use a different range of IP addresses. Even if you are not planning to use a VPN right now, it would be safest to use unique network addresses for each location.

If, however, you are operating your server in "server-only" mode and there are already servers on your network, you will need to obtain an unused IP address for your local network.

Next, you will be prompted to enter the subnet mask for your local network. If you are adding your server to an existing network, you will need to use the subnet mask used by the local network. Otherwise, unless you have a specific need for some other setting, you can accept the default setting.

Operation Mode

After configuring your SME Server for your local network, you will see the following screen. This is where you select your server's operation mode.

Select operation mode.png

Option 1: Server and gateway mode

In server and gateway mode, your server provides services (such as e-mail, web services, file and print sharing) to your network and also acts as a gateway between your internal network and the outside world. The fact that it serves as a "gateway" means it has separate interfaces with each network, and provides security and routing.

If you configure your server to operate in server and gateway mode, your server will require either:

 1. two ethernet adapters (one to communicate with the local network and the other to communicate with the external network/Internet)
 1. one ethernet adapter (for the local network) and a modem for a dialup connection

With server and gateway mode, there are a number of extra parameters that will need to be configured. These will be discussed in the next section.

Option 2: Private server and gateway

This mode is a variation of option 1 and provides the same functionality with the following differences:

  • our web server is not visible to anyone outside of the local network.
  • our mail server is not accessible from outside of the local network.
  • Additional firewall rules have been configured to drop packets for various services (such as 'ping' requests).

All services are available on the internal network. The differences are entirely in how your server is seen by the external world.

You would select this mode only if you wish to use the server as a gateway, but do not wish to publish any services to the external Internet.

Option 3: Server-only mode

Server-only mode is appropriate if you do not wish to use the gateway capabilities of your server. In this configuration, your server connects only to the local network and does not connect directly to the outside world (although it may connect indirectly through your firewall or another server).


Warning.png Warning:
SME 9.2 ISO only, DO NOT enable nic bonding on an initial install when server only mode is selected. See HERE for details

Warning.png Warning:
Because the server "trusts" the local network to be secure in server-only mode, it must be behind a firewall of some type. Under no conditions should it be directly connected to the Internet.

Your network will resemble the image below:

Network4.png

If you have a connection to the Internet by way of another gateway or corporate firewall, you can configure your server to provide services (including e-mail, web services, file and print-sharing) to your network. In this instance, you do not need your server to provide the gateway role because that role is fulfilled by your firewall. If you select Option 3, " Server-only mode - protected network ", your server will provide your local network with web, e-mail, file and print-sharing.

On the next configuration screen, you should enter the IP address for the Internet gateway on your local network. If you do not have an Internet connection, simply leave this configuration screen blank.

Configuring Server and Gateway Mode

If you are configuring your server to operate in server and gateway mode, you must select one of two Internet connection types - a dedicated connection (such as ADSL or cable modem) or a dialup connection (in which case you will be connecting to your ISP via a modem).

Select ext access mode.png

The next step after selecting a connection type is to enter the specific parameters representing that connection.

Server and Gateway Mode - Dedicated

How you configure your server's external interface depends on whether you are using a dedicated connection or a dialup connection. Therefore, if you configured your server for "server and gateway mode - dedicated connection" you will be presented with very different configuration screens than if you configured the server for "server and gateway - dialup connection" (as discussed in the next section).

Configuring Your External Ethernet Adapter

As you did previously with your local ethernet adapter, you need to configure the driver for your external ethernet adapter. As before, the software will attempt to detect the card. If it correctly identifies the card, you can proceed using Option 1, "Keep current driver". If it does not, you will need to manually select the driver.

Select ext enet driver.png

Assigning Your Ethernet Adapters to Network Connection

To communicate successfully, your server needs to know which ethernet adapter connects it to the internal network and which adapter connects it to the external network/Internet. Your server will make this designation automatically - the first ethernet adapter (in position "eth0") will normally be assigned to the local, internal network and the second ethernet adapter (in position "eth1") will normally be assigned to the external network/Internet. In the event that this assumption is incorrect, this screen allows you to easily swap that designation.

If you don't know which ethernet adapter is designated to eth0 and which is designated to eth1, we suggest you leave it in the default configuration while completing the rest of the screens. You will later have the opportunity to "Test Internet Access" from the server console. If your test fails at that time, return to this screen, swap the card assignment and retry the test.

Select ethernet card assignment.png


Information.png Tip:
If you are using two different network interface cards, you will see which driver is associated with eth0 and which is associated with eth1. This information can help you determine which card is eth0 and which is eth1. If you have two cards that use the identical driver you will see a screen such as the one above where the actual driver is not listed.

Configuring Your External Interface

With a dedicated connection in server and gateway mode, you will be presented with the following screen:

Select ext interface config.png

Your server must know three additional things to communicate on the Internet:

  • its own unique IP address so that Internet data packets can reach it.
  • a subnet mask (also called a netmask) which looks like an IP address and allows other computers to infer your network address from your IP address.
  • the IP address of the external gateway for your server. This is the IP address of the router on your server's external network. It identifies the computer that your server should contact in order to exchange information with the rest of the Internet.

Normally, you would need to know this information and enter it into the server console. However, most ISPs are capable of automatically assigning these configuration parameters to your server using a DHCP server or PPPoE .

If you have a static IP address and your ISP is configuring your server using DHCP or PPPoE, select Option 1, 2 or 3 depending upon how you will be connecting to your ISP. When you first connect to your ISP, your server will automatically be given its external interface configuration parameters.

If your ISP is providing you with a dynamic IP address, the ISP will configure this through DHCP or PPPoE and your server will be re-configured automatically whenever your IP address changes. If you plan to use a Dynamic DNS service, select Option 2. Otherwise, select Option 1.

There are some very good reasons to use a dynamic DNS service if you have a dynamically assigned IP address. It is a simple, affordable way to ensure continuity of service when your IP address changes. Please read the next section on dynamic DNS for more information about dynamic DNS.

If you are using ADSL and need PPP over Ethernet, choose Option 3. You will then be asked for the user name and password you use to connect to your ISP. Note that some ISPs require you to enter their domain name as well as your user name.

If you have a static IP address and your ISP does not offer DHCP or PPPoE, then your ISP will give you the static IP address, subnet mask (or netmask), and the gateway IP address of the device that your server should connect to in order to communicate with the Internet. Assuming you have this information on hand, you can go ahead and select Option 4. Successive screens will prompt you to enter each parameter.


Information.png Tip:
What is PPPoE?

PPPoE is the Point-to-Point Protocol over Ethernet . Essentially, it is an implementation of the popular PPP protocol used for dialup connections - only configured to run over an Ethernet connection. Many ISPs that provide ADSL connections use PPPoE as the method of connecting their customers to the Internet over ADSL.


Configuring Dynamic DNS

If you choose either of the DHCP options or PPPoE, you will be presented with an additional screen where you can choose which dynamic DNS service you wish to use.

Select dyn dns.png

The server is pre-configured to operate with four dynamic DNS organizations: yi.org, dyndns.com, dyndns.org, and tzo.com. (You can elect to use a different service, but doing so would require some customization of the server.) Once the service is selected, the subsequent two screens will prompt you to enter your account name and the password for your account. (These two parameters would be given to you by the service. Note that the dynamic DNS service may place restrictions on which domain name you can use for your company.) Please read Appendix B on dynamic DNS for more information about whether a dynamic DNS is right for you.

NB. the script for "dyndns.com - Commercial service" doesn't work, if you wish to use this service select custom and write your own script.

Configuring the Server for Server and Gateway Mode - Dialup Access

If you select dialup access, successive screens will ask you for the following information:

  • information regarding the modem or ISDN connection with your ISP, such as the serial port your modem is connected to *2
  • modem or ISDN initialization screen - most users can simply leave this blank, but with some particular modems or ISDN cards, additional information may need to be entered here
  • the dialup access phone number
  • username
  • password
  • connection policy

This last item may be of special interest. As shown in the screen below, you can configure what type of policy you wish to have in place during typical work hours. If you are in a small office and wish to share your phone line between your computer and phone or fax, you may wish to minimize the time you are online. This is also true if your ISP charges a fee on a per-minute basis. On the other hand, if you have a separate phone line or unlimited time with your ISP, you might want to have long connection times or a continuous connection.


Warning.png Warning:
If you are using a dial-on-demand link to your ISP, please be aware that you can incur very steep phone charges due to dialup connection attempts to the ISP. We are aware of at least one case in which a failed modem link at the ISP resulted in several thousand connection attempts over a couple of days - and a hefty phone bill. If your telephone carrier charges you per-call or per-minute fees, we suggest that you contact your ISP and ask whether it is willing to assume responsibility if a failure at their end results in a large phone bill.

After configuring this policy for "work" hours, you can then configure the policy for time outside of office hours and additionally for the weekend. Notice that you do have the choice of never, which would allow you to restrict your system from connecting on weekends or during off-hours.

Select connect policy.png

The connection policy defines several choices including Short, Medium or Long. These specify how long the server should wait before disconnecting the dialup connection. If your office only shares a single phone line, the Short option minimizes the amount of connection time and frees up the phone line for later use. The down side to this is that if someone is reading a long page on the web site or steps away from their computer for a brief moment, when they want to then go to another web page, the server will probably have disconnected and will need to redial and connect. On the other hand, setting the Long connection time will result in users experiencing fewer delays while waiting for the server to reconnect. However, the phone line will used for a larger amount of time.

There are two separate timeout values configured by each choice. One value is the length of time since the last HTTP (web) packet went through the server. The other is a more general timeout for any other types of packets. The difference is there because it is assumed that people reading a web page may take longer to go on to another web page, whereas users connecting to another service (such as ssh or POP3 to an external server) probably will be more active than someone using a web browser. The timeout values are shown in the table below.

Choice HTTP Timeout Other Timeout
Short 3 minutes 30 seconds
Medium 10 minutes 5 minutes
Long 20 minutes 10 minutes

Note that there is also the option for a Continuous dial-up connection. Choosing this option is basically equivalent to creating a permanent or dedicated connection, but only doing so through the use of a dial-up connection and a modem or ISDN adapter. One example of this use might be to set a Continuous connection policy during work hours and then some variable policy during off-hours and the weekend. Assuming that your ISP is okay with this arrangement and you can afford to do so financially, these settings would give your users the fastest response time as the connection would always be online.

#2 Your modem documentation may indicate which serial port is used by the modem. You may also be able to visually identify which port your modem uses.

Dialup phone numbers with # and * characters

bugzilla:4592


Warning.png Warning:
When entering your dialup phone number the default allowable character set does not include # and/or *. If your country uses dialup phone numbers with # and/or * you will need to edit the following script

nano /usr/lib/perl5/site_perl/esmith/console/configure.pm


Important.png Note:
As of SME Server 9.x, the path to the esmith perl libraries is /usr/share/vendor_perl/esmith.

Section


DIALUP_ACCESS_NUMBER:


Change line 1398 "if ($choice =~ /^[-,0-9]+$/)"

To "if ($choice =~ /^[-,\#\*0-9]+$/)"

Which allows '#' and '*' in the Dialup phone number

save changes.

Configuring Your DHCP Server

You now will be prompted regarding DHCP service. Your SME Server can be configured to provide DHCP service to your internal network. The DHCP server can automatically configure the other computers on your internal network with such parameters as non-routable IP address, subnet mask and gateway IP address. This reduces the risk of error and simplifies the process of configuring your network.

We recommend configuring your server to use DHCP to configure all of your network clients. You should not do this if there is an existing DHCP server on your network as there should typically be only one DHCP server per network.

Select dhcp server config.png

Configuring the DHCP Address Range

Before the DHCP server is able to assign IP addresses to the computers on your network, you need to tell it what range of IP addresses it can safely distribute. As above, this section is pre-configured with defaults that are appropriate in most situations. If you have fewer than 180 machines on your local network and no reason to prefer one range of IP addresses over another, you can simply accept the defaults for these screens. Client IP Addresses are handed out at the high end of the range.