<s>
Boot	B-Device
Service	I-Device
Discovery	I-Device
Protocol	I-Device
(	O
BSDP	B-Device
)	O
is	O
an	O
Apple-developed	O
,	O
standards-conforming	O
extension	O
of	O
DHCP	B-Protocol
.	O
</s>
<s>
It	O
allows	O
Macintosh	B-Device
computers	O
to	O
boot	B-Operating_System
from	O
bootable	B-Operating_System
images	O
on	O
a	O
network	B-Architecture
instead	O
of	O
local	O
storage	O
media	O
such	O
as	O
CD	O
,	O
DVD	O
,	O
or	O
hard	B-Device
disk	I-Device
.	O
</s>
<s>
The	O
DHCP	B-Protocol
options	O
used	O
are	O
the	O
"	O
vendor-specific	O
information	O
"	O
option	O
(	O
number	O
43	O
)	O
and	O
the	O
"	O
vendor	O
class	O
identifier	O
"	O
option	O
(	O
number	O
60	O
)	O
.	O
</s>
<s>
There	O
are	O
three	O
versions	O
of	O
BSDP	B-Device
,	O
though	O
usually	O
version	O
1.0	O
is	O
used	O
.	O
</s>
<s>
All	O
versions	O
enable	O
a	O
client	B-Protocol
to	O
choose	O
from	O
several	O
bootable	B-Operating_System
images	O
offered	O
by	O
a	O
server	B-Application
.	O
</s>
<s>
The	O
of	O
BSDP	B-Device
is	O
Darwin	B-Operating_System
's	O
BOOTP	B-Device
server	B-Application
,	O
which	O
is	O
part	O
of	O
Mac	B-Application
OS	I-Application
's	O
NetBoot	B-Device
feature	O
.	O
</s>
<s>
The	O
DHCP	B-Protocol
server	I-Protocol
and	O
client	B-Protocol
send	O
a	O
vendor	O
class	O
option	O
that	O
contains	O
an	O
ASCII-encoded	O
string	O
with	O
three	O
parts	O
delimited	O
by	O
a	O
/	O
character	O
.	O
</s>
<s>
The	O
first	O
part	O
is	O
AAPLBSDPC	O
,	O
which	O
advertises	O
BSDP	B-Device
capability	O
.	O
</s>
<s>
The	O
second	O
part	O
is	O
the	O
client	B-Protocol
's	O
architecture	O
(	O
"	O
ppc	B-Architecture
"	O
or	O
"	O
i386	B-Operating_System
"	O
)	O
.	O
</s>
<s>
According	O
to	O
the	O
DHCP	B-Protocol
Option	O
carrying	O
the	O
number	O
43	O
is	O
reserved	O
for	O
vendor	O
specific	O
information	O
.	O
</s>
<s>
(	O
According	O
to	O
Apple	O
's	O
documentation	O
,	O
the	O
boot	B-Operating_System
image	O
ID	O
can	O
range	O
up	O
to	O
65535	O
.	O
</s>
<s>
Here	O
is	O
possible	O
to	O
specify	O
a	O
network-accessible	O
mount	O
where	O
data	O
will	O
be	O
written	O
after	O
a	O
successful	O
boot	B-Operating_System
.	O
</s>
<s>
If	O
this	O
field	O
is	O
not	O
specified	O
and	O
no	O
storage	O
medium	O
is	O
available	O
locally	O
on	O
the	O
client	B-Protocol
,	O
then	O
the	O
boot	B-Operating_System
process	I-Operating_System
for	O
Mac	B-Application
OS	I-Application
X	O
is	O
aborted	O
.	O
</s>
<s>
Officially	O
,	O
Mac	B-Application
OS	I-Application
X	O
only	O
supports	O
AFP	B-Protocol
shadow	O
mount	O
paths	O
.	O
</s>
<s>
However	O
,	O
NFS	O
may	O
be	O
used	O
after	O
a	O
modifying	O
of	O
the	O
startup	O
files	O
of	O
the	O
system.129	O
"	O
shadow	O
file	O
path	O
"	O
String	O
(	O
URL	O
)	O
130	O
"	O
machine	O
name	O
"	O
(	O
Name	O
of	O
system	O
to	O
boot	B-Operating_System
?	O
</s>
<s>
The	O
first	O
field	O
here	O
,	O
01	O
01	O
02	O
,	O
means	O
that	O
the	O
packet	O
is	O
a	O
BSDP	B-Device
"	O
SELECT	O
"	O
message	O
.	O
</s>
<s>
The	O
01	O
declares	O
that	O
field	O
specifies	O
the	O
BSDP	B-Device
Message	O
Type	O
.	O
</s>
<s>
The	O
following	O
08	O
04	O
81	O
00	O
07	O
e5	O
means	O
that	O
the	O
boot	B-Operating_System
image	O
with	O
the	O
ID	O
2164262885	O
is	O
selected	O
.	O
</s>
<s>
Finally	O
,	O
82	O
0a	O
4e	O
65	O
74	O
42	O
6f	O
6f	O
74	O
30	O
30	O
31	O
means	O
that	O
a	O
string	O
with	O
0x0a	O
=	O
10	O
characters	O
,	O
namely	O
"	O
NetBoot001	O
"	O
,	O
is	O
the	O
name	O
of	O
the	O
system	O
to	O
boot	B-Operating_System
.	O
</s>
