<s>
arpwatch	B-Protocol
is	O
a	O
computer	O
software	O
tool	O
for	O
monitoring	O
Address	O
Resolution	O
Protocol	O
traffic	O
on	O
a	O
computer	B-Architecture
network	I-Architecture
.	O
</s>
<s>
It	O
generates	O
a	O
log	O
of	O
observed	O
pairing	O
of	O
IP	B-Protocol
addresses	I-Protocol
with	O
MAC	O
addresses	O
along	O
with	O
a	O
timestamp	O
when	O
the	O
pairing	O
appeared	O
on	O
the	O
network	O
.	O
</s>
<s>
arpwatch	B-Protocol
was	O
developed	O
by	O
Lawrence	O
Berkeley	O
National	O
Laboratory	O
,	O
Network	O
Research	O
Group	O
,	O
as	O
open-source	B-Application
software	I-Application
and	O
is	O
released	O
under	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
