The following information describes the services provided by the address server.
The DHCP server responds to both a DHCP and a BOOTP server.
NOTE: The BOOTP server is available on the 140 NOE 771 xx models.
The BOOTstrap Protocol (BOOTP) software, compliant with RFC 951, is used to assign IP addresses to nodes on an Ethernet network. Devices (hosts) on the network send BOOTP requests during their initialization sequence. A BOOTP server that receives the request will extract the required IP address information from its database and place it in BOOTP response messages to the requesting devices. The devices will use the assigned IP addresses from the BOOTP server for all network communication.
NOTE: In order for BOOTP to work properly, you need to correctly configure the following:
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IP address
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subnetwork mask
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gateway address
Your NOE 771 xx module comes supplied with a BOOTP server. This feature allows you to provide IP addresses to all the I/O devices being serviced by the NOE 771 xx. Providing a BOOTP server that is built into your NOE 771 xx module eliminates the need for an external BOOTP server.
NOTE: The NOE 771 xx’s BOOTP server can not provide its own IP address.
You can configure your NOE 771 xx’s BOOTP server from the module’s HTTP Web page. Configure the 140 CPU 651 x0 using the Control Expert editors. Configuring allows you to add to, remove from, and edit devices in the BOOTP server’s database, which is maintained in the module’s non-volatile memory.
NOTE: The DHCP server is available on the 140 NOE 771 x1 models.
The Dynamic Host Configuration Protocol (DHCP) is a superset of the BOOTP protocol. Your 140 NOE 771 x1 has a DHCP server. The DHCP server is compliant with RFC 1531. The DHCP server can be used to provide the IP configuration to devices using BOOTP or devices using DHCP.
The DHCP server has entries that use the MAC address to serve the IP configuration and entries in the server that use the role name to serve the IP configuration. Elsewhere in this book are details for the NOE
address server configuration.
NOTE: Before placing the NOE on a corporate network, Schneider Electric recommends that you discuss the installation with your MIS department. It is likely that your company's corporate network has at least one DHCP server running already. If the NOE's DHCP server is running on the same network, it may disturb the network.
To avoid any possible problem related to the NOE's DHCP server on the corporate network, ensure that the DHCP server is not running in the NOE by not having address entries in the configuration. If there are no configured devices in the
address server configuration page, then the NOE will not start the DHCP server.
