<s>
The	O
Neighbor	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
Monitor	O
(	O
NDPMon	B-Protocol
)	O
is	O
a	O
diagnostic	O
software	O
application	O
used	O
by	O
network	O
administrators	O
for	O
monitoring	O
ICMPv6	B-Protocol
packets	O
in	O
Internet	B-Protocol
Protocol	I-Protocol
version	I-Protocol
6	I-Protocol
(	O
IPv6	B-Protocol
)	O
networks	O
.	O
</s>
<s>
NDPMon	B-Protocol
observes	O
the	O
local	O
network	O
for	O
anomalies	O
in	O
the	O
function	O
of	O
nodes	O
using	O
Neighbor	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
(	O
NDP	O
)	O
messages	O
,	O
especially	O
during	O
the	O
Stateless	O
Address	O
Autoconfiguration	O
.	O
</s>
<s>
When	O
an	O
NDP	O
message	O
is	O
flagged	O
,	O
it	O
notifies	O
the	O
administrator	O
by	O
writing	O
to	O
the	O
syslog	B-Protocol
or	O
by	O
sending	O
an	O
email	O
report	O
.	O
</s>
<s>
For	O
IPv6	B-Protocol
,	O
NDPMon	B-Protocol
is	O
an	O
equivalent	O
of	O
Arpwatch	B-Protocol
for	O
IPv4	B-Protocol
,	O
and	O
has	O
similar	O
basic	O
features	O
with	O
added	O
attacks	O
detection	O
.	O
</s>
<s>
NDPMon	B-Protocol
runs	O
on	O
Linux	B-Application
distributions	O
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
FreeBSD	B-Operating_System
,	O
NetBSD	B-Device
and	O
OpenBSD	B-Operating_System
.	O
</s>
<s>
NDPMon	B-Protocol
also	O
maintains	O
a	O
list	O
of	O
neighbors	O
on	O
the	O
link	O
and	O
monitors	O
all	O
advertisements	O
and	O
network	O
changes	O
.	O
</s>
<s>
NDPMon	B-Protocol
is	O
free	B-Application
software	I-Application
published	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
version	O
2.1	O
.	O
</s>
<s>
NDPMon	B-Protocol
generates	O
various	O
reports	O
and	O
alerts	O
,	O
including	O
:	O
</s>
<s>
A	O
set	O
of	O
plugins	O
are	O
available	O
for	O
NDPMon	B-Protocol
:	O
</s>
