<s>
Marionnet	B-Application
is	O
a	O
virtual	B-Protocol
network	I-Protocol
laboratory	O
:	O
it	O
allows	O
users	O
to	O
define	O
,	O
configure	O
and	O
run	O
complex	O
computer	B-Architecture
networks	I-Architecture
without	O
any	O
need	O
for	O
physical	O
setup	O
.	O
</s>
<s>
Support	O
is	O
also	O
provided	O
for	O
integrating	O
the	O
virtual	B-Protocol
network	I-Protocol
with	O
the	O
physical	O
host	O
network	O
.	O
</s>
<s>
Marionnet	B-Application
was	O
born	O
in	O
April	O
2005	O
as	O
a	O
simple	O
textual	O
interface	O
to	O
Netkit	O
,	O
written	O
in	O
OCaml	B-Language
by	O
Jean-Vincent	O
Loddo	O
at	O
the	O
Paris	O
13	O
University	O
for	O
his	O
own	O
networking	B-Architecture
course	O
.	O
</s>
<s>
The	O
code	O
has	O
since	O
been	O
completely	O
rewritten	O
and	O
redesigned	O
in	O
September	O
2005	O
,	O
in	O
order	O
to	O
remove	O
the	O
dependency	O
from	O
Netkit	O
and	O
to	O
ease	O
the	O
construction	O
of	O
a	O
graphical	O
interface	O
,	O
partly	O
built	O
on	O
DOT	B-Application
.	O
</s>
<s>
Marionnet	B-Application
has	O
reached	O
a	O
fairly	O
stable	O
state	O
and	O
is	O
being	O
successfully	O
used	O
for	O
teaching	O
networks	O
in	O
several	O
universities	O
around	O
the	O
world	O
.	O
</s>
<s>
Internationalization	O
is	O
on	O
the	O
way	O
(	O
mostly	O
in	O
the	O
branch	O
)	O
through	O
GNU	B-Application
Gettext	I-Application
.	O
</s>
<s>
So	O
far	O
Marionnet	B-Application
has	O
been	O
presented	O
at	O
two	O
international	O
Computer	B-General_Concept
Science	I-General_Concept
conferences	O
,	O
many	O
French	O
events	O
and	O
at	O
FOSDEM	O
.	O
</s>
<s>
On	O
top	O
of	O
a	O
Linux	B-Application
host	O
,	O
the	O
emulation	O
of	O
guest	O
machines	O
is	O
achieved	O
through	O
User	B-Application
Mode	I-Application
Linux	I-Application
technology	O
that	O
allows	O
to	O
run	O
many	O
Linux	B-Application
kernels	O
in	O
user	O
space	O
as	O
regular	O
processes	O
.	O
</s>
<s>
VDE	O
-	O
Virtual	O
Distributed	O
Ethernet	O
project	O
is	O
responsible	O
of	O
linking	O
together	O
Uml	O
machines	O
in	O
a	O
virtual	B-Protocol
network	I-Protocol
,	O
</s>
<s>
its	O
purpose	O
is	O
to	O
emulate	O
cable	O
,	O
hub	B-Protocol
and	O
switch	O
devices	O
allowing	O
also	O
to	O
introduce	O
perturbations	O
in	O
the	O
communication	O
.	O
</s>
<s>
On	O
top	O
of	O
this	O
raw	O
emulated	O
network	O
Marionnet	B-Application
acts	O
as	O
a	O
coherent	O
manager	O
and	O
as	O
a	O
GUI	O
.	O
</s>
<s>
Marionnet	B-Application
is	O
an	O
example	O
of	O
a	O
complex	O
concurrent	O
application	O
written	O
in	O
a	O
functional	B-Language
language	I-Language
,	O
using	O
relatively	O
advanced	O
programming	O
techniques	O
.	O
</s>
<s>
Full	O
binary	B-General_Concept
compatibility	I-General_Concept
with	O
user-level	O
Linux	B-Application
software	O
which	O
runs	O
on	O
virtual	O
machines	O
.	O
</s>
<s>
Ability	O
to	O
use	O
host	O
X	B-Operating_System
server	O
to	O
run	O
graphical	O
application	O
(	O
wireshark	O
...	O
)	O
.	O
</s>
<s>
Copy-on-write	B-Language
file	O
systems	O
,	O
allowing	O
to	O
economize	O
on	O
disk	O
space	O
usage	O
.	O
</s>
<s>
"	O
Gateway	B-Application
"	O
device	O
to	O
connect	O
virtual	B-Protocol
network	I-Protocol
to	O
host	O
network	O
.	O
</s>
<s>
Intuitive	O
GUI	O
with	O
the	O
network	B-Application
diagram	I-Application
dynamically	O
updated	O
.	O
</s>
<s>
Marionnet	B-Application
has	O
showed	O
good	O
performance	O
with	O
complex	O
networks	O
(	O
~	O
15	O
machines	O
)	O
even	O
on	O
relatively	O
old	O
machines	O
,	O
remaining	O
very	O
responsive	O
.	O
</s>
<s>
The	O
main	O
goal	O
of	O
Marionnet	B-Application
is	O
the	O
teaching	O
of	O
computers	O
networks	O
in	O
university	O
laboratories	O
,	O
although	O
it	O
could	O
be	O
a	O
valuable	O
tool	O
also	O
for	O
high	O
schools	O
.	O
</s>
<s>
Despite	O
being	O
teaching-oriented	O
Marionnet	B-Application
may	O
be	O
used	O
to	O
emulate	O
networks	O
for	O
test	O
or	O
development	O
purposes	O
.	O
</s>
