<s>
A	O
virtual	B-Protocol
packet	I-Protocol
is	O
a	O
tool	O
used	O
to	O
overcome	O
the	O
problem	O
of	O
trying	O
to	O
send	O
data	O
between	O
two	O
heterogeneous	B-Protocol
networks	I-Protocol
.	O
</s>
<s>
To	O
fix	O
this	O
,	O
hardware-independent	O
packet	O
formats	O
(	O
or	O
virtual	B-Protocol
packets	I-Protocol
)	O
were	O
created	O
to	O
overcome	O
the	O
heterogeneity	O
.	O
</s>
<s>
Virtual	B-Protocol
packets	I-Protocol
include	O
packets	O
at	O
any	O
layer	O
or	O
sublayer	O
(	O
as	O
those	O
terms	O
are	O
used	O
in	O
,	O
for	O
example	O
,	O
the	O
OSI	O
model	O
)	O
above	O
the	O
most	O
basic	O
packets	O
or	O
frames	O
used	O
in	O
a	O
network	O
.	O
</s>
<s>
These	O
"	O
virtual	B-Protocol
packets	I-Protocol
"	O
allow	O
heterogeneous	B-Protocol
networks	I-Protocol
to	O
talk	O
to	O
each	O
other	O
using	O
a	O
common	O
protocol	O
.	O
</s>
