IFBD-HW03/04 Product Specifications Rev. 0.00
3.3.1.1. DHCP/BOOTP
This product conforms to RFC2131/RFC2132. It is possible to get the IP address, sub-net mask,
gateway address and DNS server address using either the DHCP server or the BOOTP server.
A work station running either a DHCP server or BOOTP server is necessary for setting IP addresses
using DHCP/BOOTP.
• Supports Windows NT DHCP server specifications (specifications incorporating
Microsoft expansion).
• Because part of the DHCP Discover protocol is compatible with the BOOTP Request,
both are handled as the same thing. For example, if a BOOTP Reply is returned for a
DHCP Discover, the system uses the address obtained by BOOTP.
• The DHCP/BOOTP Request constantly sends with a broadcast (255.255.255.255).
However, only the DHCP Renew Request (delay request for address use time) is sent to
the server that obtained that address.
• DHCP/BOOTP timeout is 4 seconds, which is the recommended value for RFC2131.
However, variable ±1 second according to a random number. There are three retries.
• Use the set IP address in the issuer’s address and DHCP/BOOTP CIADDR (client IP
address) field if the IP address is preset. When a normal response is received, it
switches to the newly obtained IP address.
• The issuer address and CIADDR become 0.0.0.0 if the IP address is not set. Also, in
such a case, a “B” flag (0x8000) is set to the DHCP Discover packet flags field, and a
request is made to the server for each ‘broadcast of DHCP Response.’
Setting Method: Register the IP addresses to be set and the combination of MAC addresses to the
DHCP/BOOTP server, then turn on the power to the product.
3.3.1.2. RARP
A work station running either an RARP server is necessary for setting IP addresses using RARP.
Setting Method: Register the IP addresses to be set and the combination of MAC addresses to the
RARP server, then turn on the power to the product.