Cabletron Systems CSMIM2-16 Installation Manual page 33

When the CSMIM2 receives a BOOTP response with the sm, gw, and ip
set, it sets the respective parameters: subnet_mask,
load_dump_gateway, and inet_addr. The Vendor Magic Cookie must
be set to auto. This indicates that bootpd should respond to the client
(CSMIM2 in this case) with whatever format the client requests; the
CSMIM2 (client) always requests in the decimal dot notation format
(99.130.83.99). The bootpd adds the address of the host on which it is
running as the Server Address in the bootp response message. The ROMs
use the Server Address as the preferred load host and store it in the
pref_load_addr parameter.
The bootpd must be running on the CSMIM2's preferred load
NOTE
host.
If the CSMIM2 does not receive a successful BOOTP response, it uses
RARP to get the boot information. For a successful RARP retrieval,
TCP/IP must be running on a host that is on the same network as the
CSMIM2 and the the host's ARP table must be initialized with the
CSMIM2's Internet and Ethernet addresses (see the arp man page,
arp -s).
The only boot information that RARP provides is the CSMIM2's Internet
address. The ROMs save this information in the inet_addr parameter.
The ROMs use default information for the subnet mask and preferred
load host. This means the ROMs will broadcast their request.
The host serving the CSMIM2 its boot information must be running on
the same network as the CSMIM2 because the CSMIM2 only broadcasts
BOOTP and RARP queries.
CSMIM2 Installation Guide
Auto-initializing the ROMs
2-11