<s>
The	O
Better	O
Approach	O
to	O
Mobile	B-General_Concept
Ad-hoc	I-General_Concept
Networking	I-General_Concept
(	O
B.A.T.M.A.N.	B-Protocol
)	O
</s>
<s>
is	O
a	O
routing	B-Protocol
protocol	I-Protocol
for	O
multi-hop	B-General_Concept
mobile	B-General_Concept
ad	I-General_Concept
hoc	I-General_Concept
networks	I-General_Concept
which	O
is	O
under	O
development	O
by	O
the	O
German	O
"	O
Freifunk	O
"	O
community	O
and	O
intended	O
to	O
replace	O
the	O
Optimized	B-Protocol
Link	I-Protocol
State	I-Protocol
Routing	I-Protocol
Protocol	I-Protocol
(	O
OLSR	B-Protocol
)	O
.	O
</s>
<s>
B.A.T.M.A.N.	B-Protocol
</s>
<s>
'	O
s	O
crucial	O
point	O
is	O
the	O
decentralization	O
of	O
knowledge	O
about	O
the	O
best	O
route	O
through	O
the	O
network	O
—	O
no	O
single	O
node	B-Protocol
has	O
all	O
the	O
data	O
.	O
</s>
<s>
This	O
technique	O
eliminates	O
the	O
need	O
to	O
spread	O
information	O
about	O
network	O
changes	O
to	O
every	O
node	B-Protocol
in	O
the	O
network	O
.	O
</s>
<s>
The	O
individual	O
node	B-Protocol
only	O
saves	O
information	O
about	O
the	O
"	O
direction	O
"	O
it	O
received	O
data	O
from	O
and	O
sends	O
its	O
data	O
accordingly	O
.	O
</s>
<s>
The	O
data	O
gets	O
passed	O
from	O
node	B-Protocol
to	O
node	B-Protocol
,	O
and	O
packets	B-Protocol
get	O
individual	O
,	O
dynamically	O
created	O
routes	O
.	O
</s>
<s>
In	O
early	O
2007	O
,	O
the	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
developers	O
started	O
experimenting	O
with	O
the	O
idea	O
of	O
routing	O
on	O
layer	B-Protocol
2	I-Protocol
(	O
Ethernet	O
layer	O
)	O
instead	O
of	O
layer	B-Application
3	I-Application
.	O
</s>
<s>
To	O
differentiate	O
from	O
the	O
layer	B-Application
3	I-Application
routing	O
daemon	O
,	O
the	O
suffix	O
"	O
adv	O
"	O
(	O
for	O
:	O
advanced	O
)	O
was	O
chosen	O
.	O
</s>
<s>
Instead	O
of	O
manipulating	O
routing	B-Protocol
tables	I-Protocol
based	O
on	O
information	O
exchanged	O
via	O
UDP/IP	B-Protocol
,	O
it	O
provides	O
a	O
virtual	O
network	O
interface	O
and	O
transparently	O
transports	O
Ethernet	B-Protocol
packets	I-Protocol
on	O
its	O
own	O
.	O
</s>
<s>
The	O
batman-adv	O
kernel	B-Operating_System
module	O
has	O
been	O
part	O
of	O
the	O
official	O
Linux	B-Operating_System
kernel	I-Operating_System
since	O
2.6.38	O
.	O
</s>
<s>
B.A.T.M.A.N.	B-Protocol
</s>
<s>
has	O
elements	O
of	O
classical	O
routing	B-Protocol
protocols	I-Protocol
:	O
It	O
detects	O
other	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
On	O
a	O
regular	O
basis	O
,	O
every	O
node	B-Protocol
sends	O
out	O
a	O
broadcast	B-Operating_System
,	O
thereby	O
informing	O
all	O
its	O
neighbors	O
about	O
its	O
existence	O
.	O
</s>
<s>
This	O
carries	O
the	O
information	O
to	O
every	O
node	B-Protocol
in	O
the	O
network	O
.	O
</s>
<s>
In	O
order	O
to	O
find	O
the	O
best	O
route	O
to	O
a	O
certain	O
node	B-Protocol
,	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
Like	O
distance-vector	O
protocols	O
,	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
does	O
not	O
try	O
to	O
determine	O
the	O
entire	O
route	O
,	O
but	O
by	O
using	O
the	O
originator-messages	O
,	O
only	O
the	O
packet	B-Protocol
's	O
first	O
step	O
in	O
the	O
right	O
direction	O
.	O
</s>
<s>
In	O
addition	O
to	O
radio	O
networks	O
,	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
For	O
the	O
sending	O
and	O
receiving	O
of	O
originator-messages	O
(	O
information	O
about	O
existence	O
)	O
,	O
the	O
UDP	B-Protocol
port	O
1966	O
was	O
chosen	O
.	O
</s>
<s>
The	O
version	O
one	O
algorithm	O
made	O
a	O
significant	O
assumption	O
:	O
As	O
soon	O
as	O
a	O
node	B-Protocol
receives	O
existence	O
data	O
from	O
another	O
node	B-Protocol
,	O
it	O
assumes	O
it	O
can	O
also	O
send	O
data	O
back	O
.	O
</s>
<s>
The	O
mechanism	O
enables	O
the	O
node	B-Protocol
to	O
determine	O
whether	O
a	O
neighbouring	O
node	B-Protocol
provides	O
bidirectional	O
communication	O
.	O
</s>
<s>
The	O
greatest	O
innovation	O
in	O
this	O
version	O
is	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
'	O
s	O
support	O
of	O
multiple	O
network	B-Device
devices	I-Device
.	O
</s>
<s>
A	O
computer	O
or	O
router	O
running	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
When	O
so	O
deployed	O
,	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
A	O
node	B-Protocol
can	O
inform	O
the	O
network	O
that	O
it	O
provides	O
access	O
to	O
the	O
Internet	O
.	O
</s>
<s>
They	O
can	O
either	O
use	O
a	O
specific	O
gateway	O
or	O
allow	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
Announcing	O
devices	O
not	O
running	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
An	O
antenna	O
installation	O
on	O
the	O
roof	O
will	O
connect	O
to	O
the	O
wireless	O
network	O
through	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
This	O
version	O
of	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
BatMan-eXperimental	O
(	O
BMX	O
)	O
aims	O
to	O
approximate	O
the	O
real	O
exponent	O
by	O
also	O
sending	O
OGMs	O
(	O
originator	O
messages	O
)	O
multiple	O
times	O
in	O
independent	O
broadcast	B-Operating_System
datagrams	O
.	O
</s>
<s>
It	O
originated	O
as	O
an	O
independent	O
branch	O
of	O
BATMAN	B-Protocol
developed	O
by	O
Axel	O
Neumann	O
.	O
</s>
<s>
An	O
extended	O
version	O
that	O
incorporates	O
securely-entrusted	O
multi-topology	O
routing	O
(	O
SEMTOR	O
)	O
is	O
called	O
BMX7	B-Protocol
.	O
</s>
<s>
In	O
2017	O
B.A.T.M.A.N.	B-Protocol
</s>
<s>
was	O
written	O
on	O
a	O
whiteboard	O
in	O
the	O
HBO	O
series	O
Silicon	O
Valley	O
(	O
Season	O
4	O
Episode	O
2	O
)	O
where	O
the	O
show	O
's	O
lead	O
character	O
Richard	O
Hendricks	O
appears	O
to	O
include	O
B.A.T.M.A.N.	B-Protocol
</s>
