360 Systems DigiCart/E - Manual (Page 25)

Administration
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It is also possible to use DHCP and still have certain devices use fixed IP addresses. In the example above,
the server could be running DHCP for the DigiCarts, and the laptop could have a fixed IP address (this is
required if it is functioning as a second server). In this case, the laptop IP address must be set outside of the
scope of IP addresses that the DHCP server is programmed to distribute, or an exclusion range must be
programmed for the laptop’s IP address.
Setting Up the Server
Servers must be configured when they are installed so that they can establish communication on the network
and share data.
Communication Protocols
TCP/IP
This is enabled in the properties of the network interface card. This is also where the IP address of the
network interface card is specified. Set an IP address in the subnet you are going to use, normally
192.168.1.001, with a subnet mask of 255.255.255.0.
NFS
Network File Service (NFS) is a communication protocol used by DigiCart/E to transfer messages, or data,
over the Ethernet with a server. Unix and Linux systems inherently provide NFS support, but common
Windows or Mac
* systems do not. NFS services must be added to these systems in order to host DigiCart/E
communications.
See Appendix C, Installing Microsoft Windows Services for UNIX for software installation instructions.
DHCP
For all but the simplest of networks, you should use the DHCP service to automatically assign IP addresses.
This service is available on operating systems designed to be used on servers, such as Microsoft Windows
2000 Server. It is enabled and configured on Ethernet Audio Servers as supplied by 360 Systems.
DHCP uses “Scopes” to define a range of IP addresses that will be issued. Set up the DHCP scope with a
network mask of 255.255.255.0 and set the range of exported IP addresses to 192.168.1.002 to 192.168.1.200.
Do not include the address of the NIC within the scope (i.e. 192.168.1.001).
If the server has two NICs, (and is not using a load balancing/fault tolerant configuration,) a scope is defined
for its subnet as well. Normally NIC 2 is IP 192.168.2.001, and the scope for it is 192.168.2.002 to
192.168.2.200.
DHCP allows you to set the amount of time a particular IP address is “leased” to a device. This should be set
to “unlimited” to prevent any change in IP address configuration once it is established.
It is also possible to set “exclusions”, which are ranges of IP addresses that the DHCP server will not issue.
Typically an Ethernet Audio system has exclusions set for the range of available fixed IP addresses that a
* Mac OS X is expected to offer NFS support. Currently we know of no NFS server software available for OS 9 and below.