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

6.13.1. 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.

If the defaults are not appropriate to your situation, you may need a bit of background to understand how to conﬁgure this range. For example, if you

entered the server address of 192.168.1.1 and subnet mask of 255.255.255.0 (the default settings), the conﬁguration script will infer that your

"network" is 192.168.1.0 and that valid addresses are from 192.168.1.1 to 192.168.1.254. If you entered some number such as 192.168.100.1 for the

server, the script will infer that your valid addresses will be 192.168.100.1 through 192.168.100.254.

If you enter the number "192.168.202.65" as the "beginning of DHCP address range", as shown below, the ﬁrst computer served by the DHCP server

would receive the IP address of 192.168.202.65. The second computer would receive the IP address of 192.168.1.66, and so on.

If you specify that the end of the range is "192.168.202.250", as shown below, then the last computer able to receive DHCP service would be

assigned the IP address 192.168.202.250. Once all the available IP addresses within that range are assigned, your DHCP server will no longer serve

IP addresses to new computers.

6.13.2. Important issues about the DHCP address range

The usual range maximum is 254: Normally the "end of DHCP address range" cannot exceed "254". If you have more than 253 computers on your

network and would like to exceed this range maximum, you can use a Class B or Class A non-routable address for your network. In this case the

number entered in the "end of range" ﬁeld needs to be calculated and entered a little differently. If you fall into this category, we recommend you

contact Mitel Networks Corporation or a Mitel Networks Corporation authorized reseller for assistance. Note that the default range maximum is 250.

As explained below, this is to allow a few static addresses at the end of the range.

The local IP address assigned to your server itself must fall outside of this range: In other words, you should not assign your server a

non-routable IP address that is also assignable by the DHCP service to another computer on your network. If your server is assigned the IP address

of "192.168.1.1" then the lowest possible number in the DHCP range should be "2".

We recommend that you leave a small pool of IP addresses that can be manually assigned: Some of the computers (or devices such as network

printers) on your network may not be able to accept DHCP service. Therefore, it is preferable to exclude some IP addresses from the DHCP range so

they are available to be assigned manually to those computers. For example, using the 192.168.1.0 block of addresses, the default "beginning of

DHCP address range" is "192.168.1.65". This ensures that non-routable IP addresses "192.168.1.2" through "192.168.1.64" are available to you if

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Mitel SME Server V5 with ServiceLink Guía de usuario Pagina 33