<s>
The	O
Reverse	B-Protocol
Address	I-Protocol
Resolution	I-Protocol
Protocol	I-Protocol
(	O
RARP	B-Protocol
)	O
is	O
an	O
obsolete	O
computer	B-Architecture
communication	I-Architecture
protocol	O
used	O
by	O
a	O
client	B-Protocol
computer	I-Protocol
to	O
request	O
its	O
Internet	O
Protocol	O
(	O
IPv4	B-Protocol
)	O
address	O
from	O
a	O
computer	B-Architecture
network	I-Architecture
,	O
when	O
all	O
it	O
has	O
available	O
is	O
its	O
link	B-Protocol
layer	I-Protocol
or	O
hardware	O
address	O
,	O
such	O
as	O
a	O
MAC	O
address	O
.	O
</s>
<s>
RARP	B-Protocol
is	O
described	O
in	O
Internet	O
Engineering	O
Task	O
Force	O
(	O
IETF	O
)	O
publication	O
RFC	O
903	O
.	O
</s>
<s>
It	O
has	O
been	O
rendered	O
obsolete	O
by	O
the	O
Bootstrap	B-Device
Protocol	I-Device
(	O
BOOTP	B-Device
)	O
and	O
the	O
modern	O
Dynamic	B-Protocol
Host	I-Protocol
Configuration	I-Protocol
Protocol	I-Protocol
(	O
DHCP	B-Protocol
)	O
,	O
which	O
both	O
support	O
a	O
much	O
greater	O
feature	O
set	O
than	O
RARP	B-Protocol
.	O
</s>
<s>
RARP	B-Protocol
requires	O
one	O
or	O
more	O
server	O
hosts	O
to	O
maintain	O
a	O
database	O
of	O
mappings	O
of	O
Link	B-Protocol
Layer	I-Protocol
addresses	O
to	O
their	O
respective	O
protocol	O
addresses	O
.	O
</s>
<s>
Media	B-Protocol
Access	I-Protocol
Control	I-Protocol
(	O
MAC	O
)	O
addresses	O
need	O
to	O
be	O
individually	O
configured	O
on	O
the	O
servers	O
by	O
an	O
administrator	O
.	O
</s>
<s>
RARP	B-Protocol
is	O
limited	O
to	O
serving	O
only	O
IP	B-Protocol
addresses	I-Protocol
.	O
</s>
<s>
Reverse	B-Protocol
ARP	I-Protocol
differs	O
from	O
the	O
Inverse	O
Address	O
Resolution	O
Protocol	O
(	O
InARP	O
)	O
described	O
in	O
RFC	O
2390	O
,	O
which	O
is	O
designed	O
to	O
obtain	O
the	O
IP	B-Protocol
address	I-Protocol
associated	O
with	O
a	O
local	O
Frame	O
Relay	O
data	O
link	O
connection	O
identifier	O
.	O
</s>
<s>
Although	O
the	O
original	O
uses	O
for	O
RARP	B-Protocol
have	O
been	O
superseded	O
by	O
different	O
protocols	O
,	O
some	O
modern	O
day	O
protocols	O
use	O
RARP	B-Protocol
to	O
handle	O
MAC	O
migration	O
,	O
particularly	O
in	O
virtual	O
machines	O
,	O
using	O
a	O
technique	O
originating	O
in	O
QEMU	B-Application
.	O
</s>
<s>
Cisco	O
's	O
Overlay	B-Protocol
Transport	I-Protocol
Virtualization	I-Protocol
(	O
OTV	O
)	O
.	O
</s>
<s>
RARP	B-Protocol
is	O
used	O
to	O
update	O
the	O
layer	O
2	O
forwarding	O
tables	O
when	O
a	O
MAC	O
address	O
moves	O
between	O
data	O
centers	O
.	O
</s>
<s>
VMware	B-Application
vSphere	I-Application
's	O
vMotion	O
.	O
</s>
<s>
RARP	B-Protocol
is	O
used	O
when	O
a	O
VM	O
MAC	O
moves	O
between	O
hosts	O
.	O
</s>
