<s>
ipfirewall	B-Protocol
or	O
ipfw	B-Protocol
is	O
a	O
FreeBSD	B-Operating_System
IP	B-Protocol
,	O
stateful	O
firewall	O
,	O
packet	B-Protocol
filter	I-Protocol
and	O
traffic	O
accounting	O
facility	O
.	O
</s>
<s>
Its	O
ruleset	O
logic	O
is	O
similar	O
to	O
many	O
other	O
packet	B-Protocol
filters	I-Protocol
except	O
IPFilter	B-Protocol
.	O
</s>
<s>
ipfw	B-Protocol
is	O
authored	O
and	O
maintained	O
by	O
FreeBSD	B-Operating_System
volunteer	O
staff	O
members	O
.	O
</s>
<s>
It	O
can	O
either	O
be	O
used	O
as	O
a	O
loadable	B-Application
kernel	I-Application
module	I-Application
or	O
incorporated	O
into	O
the	O
kernel	B-Operating_System
;	O
use	O
as	O
a	O
loadable	B-Application
kernel	I-Application
module	I-Application
where	O
possible	O
is	O
highly	O
recommended	O
.	O
</s>
<s>
ipfw	B-Protocol
was	O
the	O
built-in	O
firewall	O
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
until	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
10.7	O
Lion	O
in	O
2011	O
when	O
it	O
was	O
replaced	O
with	O
the	O
OpenBSD	O
project	O
's	O
PF	B-Protocol
.	O
</s>
<s>
Like	O
FreeBSD	B-Operating_System
,	O
ipfw	B-Protocol
is	O
open	O
source	O
.	O
</s>
<s>
It	O
is	O
used	O
in	O
many	O
FreeBSD-based	O
firewall	O
products	O
,	O
including	O
m0n0wall	B-Protocol
and	O
FreeNAS	B-Application
.	O
</s>
<s>
A	O
port	O
of	O
an	O
early	O
version	O
of	O
ipfw	B-Protocol
was	O
used	O
since	O
Linux	B-Operating_System
1.1	O
as	O
the	O
first	O
implementation	O
of	O
firewall	O
available	O
for	O
Linux	B-Operating_System
,	O
until	O
it	O
was	O
replaced	O
by	O
ipchains	B-Application
.	O
</s>
<s>
A	O
modern	O
port	O
of	O
ipfw	B-Protocol
and	O
the	O
dummynet	O
traffic	O
shaper	O
is	O
available	O
for	O
Linux	B-Operating_System
(	O
including	O
a	O
prebuilt	O
package	O
for	O
OpenWrt	B-Application
)	O
and	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
wipfw	O
is	O
a	O
Windows	O
port	O
of	O
an	O
old	O
(	O
2001	O
)	O
version	O
of	O
ipfw	B-Protocol
.	O
</s>
<s>
Software	O
Developer	O
First	O
public	O
release	O
Latest	O
stable	O
version	O
Cost	O
(	O
USD	O
)	O
Open	O
source	O
License	B-License
User	B-Application
interface	I-Application
Platform(s )	O
Firewalk	O
X	O
Pliris	O
2.3.7	O
(	O
US$	O
34.99	O
)	O
Proprietary	B-Application
/	O
Shareware	B-License
GUI	B-Application
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.3	I-Operating_System
(	O
PowerPC	B-Architecture
)	O
Flying	O
Buttress	O
(	O
known	O
as	O
BrickHouse	O
prior	O
to	O
v1.4	O
)	O
Brian	O
Hill	O
March	O
23	O
,	O
2001	O
1.4	O
(	O
2005-12-31	O
)	O
(	O
US$	O
25.00	O
)	O
Proprietary	B-Application
/	O
Shareware	B-License
GUI	B-Application
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.0	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.1	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.3	I-Operating_System
,	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
(	O
PowerPC	B-Architecture
)	O
Impasse	O
Glucose	O
Development	O
Corporation	O
Q2	O
2002	O
1.3	O
(	O
US$	O
10.00	O
)	O
Proprietary	B-Application
/	O
Shareware	B-License
GUI	B-Application
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.1	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
(	O
PowerPC	B-Architecture
)	O
Norton	B-Protocol
Personal	I-Protocol
Firewall	I-Protocol
for	I-Protocol
Macintosh	I-Protocol
Symantec	O
2005	O
3.0.3	O
(	O
US$	O
49.95	O
)	O
Proprietary(Symantec Software License Agreement )	O
GUI	B-Application
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.1.5	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.2	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.3	I-Operating_System
,	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4.11	I-Application
(	O
PowerPC	B-Architecture
)	O
Qtfw	O
Ryzhyk	O
Eugeney	O
August	O
23	O
,	O
2001	O
0.5	O
(	O
2002-09-20	O
)	O
BSD	B-Operating_System
GUI	B-Application
BSD	B-Operating_System
and	O
POSIX	O
operating	O
systems	O
with	O
the	O
Qt	B-Language
toolkit	I-Language
.	O
</s>
