<s>
In	O
some	O
FreeBSD	B-Operating_System
,	O
Linux	B-Application
distributions	O
,	O
and	O
other	O
Unix-like	O
operating	B-General_Concept
systems	I-General_Concept
,	O
the	O
resolvconf	B-Protocol
program	O
maintains	O
the	O
system	O
information	O
about	O
the	O
currently	O
available	O
name	B-Protocol
servers	I-Protocol
and	O
manages	O
the	O
contents	O
of	O
the	O
configuration	B-Protocol
file	I-Protocol
resolv.conf	B-Protocol
,	O
which	O
determines	O
Domain	B-Protocol
Name	I-Protocol
System	I-Protocol
(	O
DNS	B-Protocol
)	O
resolver	O
parameters	O
.	O
</s>
<s>
Before	O
a	O
computer	O
can	O
connect	O
to	O
an	O
external	O
network	O
resource	O
by	O
name	O
,	O
it	O
must	O
convert	O
that	O
alpha-numeric	O
name	O
(	O
e.g.	O
,	O
wikipedia.org	O
)	O
into	O
its	O
corresponding	O
network	B-Protocol
address	I-Protocol
called	O
an	O
IP	B-Protocol
address	I-Protocol
(	O
e.g.	O
,	O
66.230.200.10	O
)	O
.	O
</s>
<s>
The	O
computer	O
performs	O
this	O
conversion	O
by	O
contacting	O
one	O
of	O
a	O
number	O
of	O
special	O
computers	O
called	O
name	B-Protocol
servers	I-Protocol
,	O
which	O
have	O
tables	O
of	O
resource	O
names	O
and	O
corresponding	O
IP	B-Protocol
addresses	I-Protocol
.	O
</s>
<s>
The	O
information	O
about	O
the	O
servers	O
is	O
kept	O
in	O
the	O
configuration	B-Protocol
file	I-Protocol
resolv.conf	B-Protocol
.	O
</s>
<s>
However	O
,	O
when	O
multiple	O
programs	O
need	O
to	O
dynamically	O
modify	O
the	O
resolv.conf	B-Protocol
file	O
,	O
they	O
can	O
interfere	O
with	O
each	O
other	O
and	O
store	O
incorrect	O
information	O
in	O
the	O
file	O
.	O
</s>
<s>
The	O
resolvconf	B-Protocol
program	O
addresses	O
this	O
problem	O
.	O
</s>
<s>
It	O
acts	O
as	O
an	O
intermediary	O
between	O
programs	O
that	O
supply	O
name	B-Protocol
server	I-Protocol
information	O
(	O
e.g.	O
,	O
DHCP	B-Protocol
clients	O
)	O
and	O
programs	O
that	O
use	O
name	B-Protocol
server	I-Protocol
information	O
(	O
e.g.	O
,	O
resolvers	O
)	O
.	O
</s>
<s>
When	O
resolvconf	B-Protocol
is	O
properly	O
installed	O
,	O
the	O
resolv.conf	B-Protocol
file	O
is	O
replaced	O
by	O
a	O
symbolic	B-Application
link	I-Application
to	O
and	O
the	O
resolver	O
instead	O
uses	O
the	O
dynamically	O
generated	O
linked	O
file	O
.	O
</s>
<s>
In	O
a	O
system	O
without	O
resolvconf	B-Protocol
,	O
the	O
file	O
is	O
normally	O
maintained	O
manually	O
or	O
by	O
a	O
collection	O
of	O
scripts	O
.	O
</s>
<s>
Resolvconf	B-Protocol
controls	O
access	O
to	O
the	O
file	O
,	O
allowing	O
many	O
programs	O
to	O
use	O
it	O
at	O
the	O
same	O
time	O
.	O
</s>
<s>
resolvconf	B-Protocol
cannot	O
easily	O
be	O
disabled	O
on	O
some	O
systems	O
.	O
</s>
<s>
On	O
FreeBSD	B-Operating_System
it	O
can	O
be	O
disabled	O
by	O
placing	O
in	O
.	O
</s>
<s>
In	O
securely	O
administered	O
environments	O
the	O
resolvconf	B-Protocol
program	O
(	O
or	O
daemon	B-Operating_System
,	O
depending	O
on	O
the	O
implementation	O
)	O
causes	O
uneasiness	O
since	O
it	O
interferes	O
with	O
the	O
containment	O
of	O
security	O
vulnerabilities	O
,	O
making	O
changes	O
to	O
it	O
without	O
authorization	O
.	O
</s>
