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Chapter 6. Installing And Conﬁguring Your SME Server V5 with ServiceLink Software

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

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.

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.

6.13. Conﬁguring Your DHCP Server

You now will be prompted regarding DHCP service. Your SME Server V5 with ServiceLink 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.

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