<s>
OpenBGPD	B-Application
,	O
also	O
known	O
as	O
OpenBSD	B-Operating_System
Border	B-Protocol
Gateway	I-Protocol
Protocol	I-Protocol
Daemon	B-Operating_System
,	O
is	O
a	O
server	B-Application
software	I-Application
program	B-Application
that	O
allows	O
general	O
purpose	O
computers	O
to	O
be	O
used	O
as	O
routers	B-Protocol
.	O
</s>
<s>
It	O
is	O
a	O
Unix	B-Application
system	I-Application
daemon	B-Operating_System
that	O
provides	O
a	O
free	O
,	O
open-source	O
implementation	O
of	O
the	O
Border	B-Protocol
Gateway	I-Protocol
Protocol	I-Protocol
version	O
4	O
.	O
</s>
<s>
This	O
allows	O
a	O
machine	O
to	O
exchange	O
routes	O
with	O
other	O
systems	O
that	O
speak	O
BGP	B-Protocol
.	O
</s>
<s>
OpenBSD	B-Operating_System
Border	B-Protocol
Gateway	I-Protocol
Protocol	I-Protocol
Daemon	B-Operating_System
is	O
developed	O
by	O
Henning	O
Brauer	O
,	O
Peter	O
Hessler	O
,	O
and	O
Claudio	O
Jeker	O
as	O
part	O
of	O
the	O
OpenBSD	B-Operating_System
project	I-Operating_System
.	O
</s>
<s>
OpenOSPFD	B-Application
,	O
developed	O
by	O
Esben	O
Nørby	O
,	O
is	O
a	O
companion	O
daemon	B-Operating_System
of	O
OpenBGPD	B-Application
that	O
implements	O
the	O
Open	B-Protocol
Shortest	I-Protocol
Path	I-Protocol
First	I-Protocol
protocol	O
.	O
</s>
<s>
The	O
suite	O
was	O
developed	O
as	O
an	O
alternative	O
to	O
packages	O
such	O
as	O
Quagga	B-Protocol
,	O
a	O
Linux-focused	O
routing	O
suite	O
which	O
is	O
licensed	O
under	O
the	O
GPL	B-License
and	O
does	O
not	O
meet	O
the	O
project	O
's	O
requirements	O
and	O
quality	O
standards	O
.	O
</s>
<s>
The	O
design	O
goals	O
of	O
OpenBSD	B-Operating_System
Border	B-Protocol
Gateway	I-Protocol
Protocol	I-Protocol
Daemon	B-Operating_System
include	O
being	O
secure	O
(	O
non-exploitable	O
)	O
,	O
reliable	O
,	O
and	O
lean	O
enough	O
for	O
most	O
users	O
,	O
both	O
in	O
size	O
and	O
memory	B-Architecture
usage	O
.	O
</s>
<s>
It	O
must	O
also	O
be	O
able	O
to	O
quickly	O
handle	O
hundreds	O
of	O
thousands	O
of	O
table	O
entries	O
in	O
a	O
memory-efficient	O
way	O
.	O
</s>
<s>
OpenBGPD	B-Application
consists	O
of	O
a	O
parent	B-Operating_System
process	I-Operating_System
,	O
and	O
two	O
child	O
processes	O
:	O
the	O
Route	O
Decision	O
Engine	O
(	O
RDE	O
)	O
,	O
and	O
the	O
Session	O
Engine	O
(	O
SE	O
)	O
.	O
</s>
<s>
The	O
parent	B-Operating_System
process	I-Operating_System
is	O
the	O
only	O
part	O
that	O
does	O
n't	O
drop	O
privileges	O
;	O
the	O
others	O
do	O
,	O
in	O
the	O
interest	O
of	O
non-exploitability	O
.	O
</s>
<s>
The	O
parent	B-Operating_System
process	I-Operating_System
cannot	O
drop	O
privileges	O
,	O
because	O
it	O
needs	O
to	O
update	O
the	O
routing	B-Protocol
table	I-Protocol
and	O
it	O
has	O
to	O
run	O
on	O
a	O
privileged	O
port	O
(	O
179	O
)	O
.	O
</s>
