<s>
fli4l	B-Protocol
(	O
flexible	O
internet	B-Protocol
router	I-Protocol
for	O
linux	B-Application
;	O
previously	O
:	O
floppy	B-Device
isdn	B-Protocol
for	O
linux	B-Application
)	O
is	O
a	O
Linux	B-Application
distribution	I-Application
,	O
actively	O
developed	O
by	O
German	O
developers	O
since	O
2000	O
.	O
</s>
<s>
The	O
projects	O
main	O
task	O
is	O
to	O
provide	O
a	O
small	O
Linux	B-Application
system	O
that	O
turns	O
almost	O
every	O
machine	O
into	O
a	O
router	B-Protocol
.	O
</s>
<s>
The	O
distribution	O
can	O
run	O
from	O
a	O
floppy	B-Device
disk	I-Device
and	O
was	O
created	O
with	O
the	O
aim	O
of	O
simple	O
configuration	B-General_Concept
and	O
support	O
for	O
older	O
hardware	O
.	O
</s>
<s>
fli4l	B-Protocol
can	O
route	O
between	O
Ethernet	O
and	O
ISDN	B-Protocol
,	O
DSL	O
or	O
UMTS	B-Protocol
,	O
or	O
just	O
between	O
Ethernet	O
networks	O
.	O
</s>
<s>
fli4l	B-Protocol
is	O
based	O
on	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
.	O
</s>
<s>
As	O
the	O
documentation	O
is	O
very	O
extensive	O
no	O
knowledge	O
of	O
Linux	B-Application
is	O
required	O
,	O
however	O
a	O
basic	O
knowledge	O
of	O
network	B-Architecture
technology	O
is	O
needed	O
.	O
</s>
<s>
The	O
hardware	O
requirements	O
for	O
fli4l	B-Protocol
are	O
low	O
,	O
an	O
Intel	B-General_Concept
Pentium	I-General_Concept
with	O
MMX	B-Architecture
support	O
and	O
64	O
MiB	O
RAM	B-Architecture
and	O
(	O
depending	O
upon	O
the	O
configuration	B-General_Concept
)	O
one	O
or	O
two	O
network	B-Protocol
interface	I-Protocol
controllers	I-Protocol
is	O
quite	O
adequate	O
.	O
</s>
<s>
A	O
hard	B-Device
disk	I-Device
drive	I-Device
is	O
not	O
required	O
,	O
but	O
can	O
be	O
used	O
by	O
fli4l	B-Protocol
too	O
.	O
</s>
<s>
Newer	O
versions	O
of	O
fli4l	B-Protocol
provide	O
also	O
the	O
possibility	O
to	O
create	O
a	O
working	O
installation	O
on	O
a	O
CF	B-Device
card	I-Device
in	O
a	O
card	B-Device
reader	I-Device
,	O
which	O
card	O
then	O
in	O
turn	O
can	O
operate	O
from	O
a	O
CF	B-Device
adapter	O
in	O
an	O
IDE	B-Protocol
slot	O
.	O
</s>
<s>
Also	O
the	O
generation	O
of	O
an	O
ISO	B-General_Concept
image	I-General_Concept
is	O
supported	O
to	O
run	O
from	O
a	O
CD-ROM	B-Device
as	O
well	O
as	O
from	O
DOC/DOM	O
for	O
Embedded	B-Architecture
systems	I-Architecture
.	O
</s>
<s>
fli4l	B-Protocol
can	O
be	O
configured	O
on	O
Linux	B-Application
,	O
Unix	B-Application
and	O
Windows	B-Application
systems	O
using	O
just	O
text	O
files	O
.	O
</s>
<s>
In	O
addition	O
,	O
fli4l	B-Protocol
has	O
the	O
possibility	O
to	O
encrypt	O
connections	O
over	O
the	O
Internet	O
or	O
via	O
Wireless	B-Architecture
LAN	I-Architecture
using	O
OpenVPN	B-Language
or	O
PPTP	B-Protocol
(	O
Poptop	O
)	O
.	O
</s>
<s>
There	O
are	O
two	O
development	O
branches	O
for	O
fli4l	B-Protocol
,	O
a	O
stable	O
and	O
a	O
development	O
version	O
.	O
</s>
<s>
The	O
present	O
stable	O
release	O
is	O
based	O
on	O
a	O
Linux	B-Application
3.16	O
kernel	B-Operating_System
and	O
supports	O
virtualization	B-General_Concept
by	O
means	O
of	O
Xen	B-Operating_System
and	O
KVM	B-Application
.	O
</s>
<s>
USB	B-Protocol
and	O
Wireless	B-Architecture
LAN	I-Architecture
are	O
supported	O
to	O
a	O
great	O
extent	O
as	O
well	O
as	O
current	O
embedded	B-Architecture
hardware	I-Architecture
as	O
APU	O
,	O
ALIX	O
,	O
Soekris	O
,	O
and	O
EPIA	B-Device
series	O
.	O
</s>
<s>
The	O
4.0	O
development	O
version	O
also	O
provides	O
a	O
Linux	B-Application
4.1	O
kernel	B-Operating_System
.	O
</s>
<s>
Furthermore	O
,	O
it	O
implements	O
a	O
new	O
management	O
and	O
configuration	B-General_Concept
layer	O
for	O
connections	O
(	O
so-called	O
circuits	O
)	O
which	O
has	O
been	O
designed	O
from	O
the	O
ground	O
up	O
.	O
</s>
<s>
via	O
DSL	O
,	O
ISDN	B-Protocol
,	O
or	O
UMTS	B-Protocol
)	O
in	O
parallel	O
.	O
</s>
<s>
fli4l	B-Protocol
is	O
a	O
modular	O
system	O
using	O
so-called	O
OPT-packages	O
.	O
</s>
<s>
To	O
create	O
an	O
individual	O
configuration	B-General_Concept
,	O
only	O
software	O
packages	O
for	O
those	O
options	O
,	O
that	O
are	O
needed	O
,	O
are	O
downloaded	O
and	O
unzipped	O
into	O
the	O
directory	O
tree	O
.	O
</s>
<s>
To	O
extend	O
the	O
basic	O
functionality	O
,	O
a	O
wide	O
range	O
of	O
applications	O
is	O
available	O
in	O
the	O
so-called	O
OPT-database	O
;	O
for	O
example	O
,	O
optional	O
packages	O
can	O
be	O
used	O
for	O
monitoring	O
traffic	O
or	O
an	O
fli4l	B-Protocol
can	O
function	O
as	O
a	O
printserver	O
.	O
</s>
<s>
An	O
fli4l	B-Protocol
router	B-Protocol
can	O
be	O
controlled	O
and	O
monitored	O
with	O
a	O
browser-based	O
interface	O
.	O
</s>
<s>
Besides	O
,	O
the	O
program	O
imonc	O
(	O
isdn	B-Protocol
monitor	O
client	O
)	O
is	O
available	O
for	O
Windows	B-Application
and	O
Linux	B-Application
(	O
GTK	B-Application
)	O
.	O
</s>
<s>
imonc	O
allows	O
extensive	O
control	O
as	O
well	O
as	O
remote-controlled	O
update	O
of	O
the	O
router	B-Protocol
's	O
software	O
.	O
</s>
