<s>
In	O
computer	B-Architecture
networking	I-Architecture
,	O
a	O
mangled	O
or	O
invalid	B-Protocol
packet	I-Protocol
is	O
a	O
packet	B-Protocol
—	O
especially	O
IP	B-Protocol
packet	B-Protocol
—	O
that	O
either	O
lacks	O
order	O
or	O
self-coherence	O
,	O
or	O
contains	O
code	O
aimed	O
to	O
confuse	O
or	O
disrupt	O
computers	O
,	O
firewalls	B-Application
,	O
routers	B-Protocol
,	O
or	O
any	O
service	O
present	O
on	O
the	O
network	O
.	O
</s>
<s>
Mangled	B-Protocol
packets	I-Protocol
can	O
be	O
generated	O
by	O
dedicated	O
software	O
such	O
as	O
nmap	B-Language
.	O
</s>
<s>
,	O
most	O
invalid	B-Protocol
packets	I-Protocol
are	O
easily	O
filtered	O
by	O
modern	O
stateful	O
firewalls	B-Application
.	O
</s>
