How does a Web-IO get its IP address?

For the Web-IOs, the following four alternatives are available for the first assignment of the IP address. Detailed outlines of all procedures are specified in the relevant section of the Web-IO manual.

• Management and inventorying tool WuTility
  Using the Scan function of WuTility, Web-IOs and Com-Servers located in the local sub-network are automatically searched for and shown in a list. Devices whose current IP address is 0.0.0.0 (= factory default setting) can then be assigned a valid address via the button Assign IP address.
• Static ARP cache entry
  Via a static entry in the ARP cache of a TCP/IP computer located in the same sub-network followed by a ping. As also in the case of employment of WuTility, this method is only possible if the Web-IO does not yet currently have an IP address. The IP address which is to be assigned must be compatible with the address space of the local network.
  Input example in Windows: arp -s [IP address] [MAC address]
• Assignment via the serial interface
  If the Web-IO receives a continous data stream during boot-up (data format 9600, n, 8) with content “x” (=ASCII 120), a prompt is generated making it possible to enter a new IP address. This method overwrites and functions regardless of whether an IP address has already been assigned or not.
• Assignment via BOOTP / DHCP
  In centrally administered networks, the IP address can also be assigned using a DHCP or BOOTP server. This method also offers the advantage that these protocols can also be used for setting the subnet mask and the gateway address. In such centrally administered environments, before connecting the Web-IO please contact your system administrator and ask him to reserve a fixed IP address in the DHCP system for the Web-IO.

Additional information:

• Product Info for Web-IO
• Manual for Web-IO
  

How in DHCP environments do you prevent Web-IOs from receiving an unintended IP address?

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