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Debugger General Information
RARP/ARP Protocol Modules
4
BOOTP Protocol Module
TFTP Protocol Module
Network Boot Control Module
4-20
The Reverse Address Resolution Protocol (RARP) basically consists
of an identity-less node broadcasting a "whoami" packet onto the
Ethernet, and waiting for an answer. The RARP server fills an
Ethernet reply packet up with the target's Internet Address and
sends it.
The Address Resolution Protocol (ARP) basically provides a
method of converting protocol addresses (e.g., IP addresses) to
local area network addresses (e.g., Ethernet addresses). The RARP
protocol module supports systems which do not support the
BOOTP protocol.
The Bootstrap Protocol (BOOTP) basically allows a diskless client
machine to discover its own IP address, the address of a server host,
and the name of a file to be loaded into memory and executed.
The Trivial File Transfer Protocol (TFTP) is a simple protocol to
transfer files. It is implemented on top of the Internet User
Datagram Protocol (UDP or Datagram) so it may be used to move
files between machines on different networks implementing UDP.
The only thing it can do is read and write files from/to a remote
server.
The "control" capability of the Network Boot Control Module is
needed to tie together all the necessary modules and to sequence
the booting process. The booting sequence consists of two phases:
the first phase is labeled "address determination and bootfile
selection" and the second phase is labeled "file transfer". The first
phase will utilize the RARP/BOOTP capability and the second
phase will utilize the TFTP capability.
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