<s>
RTelnet	B-Protocol
is	O
a	O
SOCKS	B-Application
client	O
version	O
of	O
telnet	B-Protocol
in	O
Unix-like	B-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
The	O
RTelnet	B-Protocol
utility	O
provides	O
similar	O
functionality	O
of	O
telnet	B-Protocol
to	O
those	O
hosts	O
which	O
are	O
behind	O
a	O
firewall	B-Application
.	O
</s>
<s>
Normally	O
,	O
firewalls	B-Application
are	O
designed	O
to	O
permit	O
or	O
deny	O
network	O
transmissions	O
based	O
upon	O
a	O
set	O
of	O
rules	O
.	O
</s>
<s>
Network	O
accessibility	O
across	O
the	O
firewall	B-Application
is	O
reduced	O
in	O
order	O
to	O
provide	O
adequate	O
security	O
to	O
hosts	O
within	O
the	O
firewall	B-Application
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
many	O
services	O
can	O
not	O
directly	O
access	O
the	O
resources	O
placed	O
outside	O
the	O
firewall	B-Application
.	O
</s>
<s>
RTelnet	B-Protocol
utility	O
provides	O
functionality	O
of	O
telnet	B-Protocol
while	O
maintaining	O
the	O
security	O
requirement	O
of	O
firewall	B-Application
and	O
NAT	B-Protocol
.	O
</s>
<s>
RTelnet	B-Protocol
is	O
a	O
"	O
versatile	O
"	O
client	O
-	O
it	O
can	O
be	O
used	O
for	O
both	O
connections	O
to	O
inside	O
hosts	O
directly	O
and	O
to	O
outside	O
hosts	O
via	O
SOCKS	B-Application
proxy	I-Application
servers	O
.	O
</s>
<s>
When	O
RTelnet	B-Protocol
starts	O
,	O
it	O
prints	O
its	O
version	O
number	O
and	O
the	O
name	O
or	O
IP	O
address	O
of	O
its	O
default	O
SOCKS	B-Application
proxy	I-Application
server	O
to	O
stderr	O
stream	O
channel	O
.	O
</s>
<s>
It	O
then	O
consults	O
the	O
configuration	O
file	O
(	O
/etc/socks.conf	O
)	O
to	O
determine	O
whether	O
a	O
request	O
should	O
be	O
allowed	O
or	O
denied	O
based	O
on	O
the	O
requesting	O
user	O
,	O
the	O
destination	O
host	O
,	O
and	O
the	O
requested	O
service	O
.	O
</s>
<s>
For	O
allowable	O
requests	O
,	O
the	O
configuration	O
file	O
also	O
dictates	O
whether	O
direct	O
or	O
proxy	O
connection	O
should	O
be	O
used	O
to	O
the	O
given	O
destination	O
,	O
and	O
optionally	O
the	O
actual	O
SOCKS	B-Application
servers	I-Application
to	O
use	O
for	O
the	O
proxy	O
connection	O
.	O
</s>
<s>
The	O
RTelnet	B-Protocol
utility	O
requires	O
the	O
libsocket.so	O
shared	O
library	O
to	O
run	O
.	O
</s>
<s>
RTelnet	B-Protocol
is	O
a	O
listed	O
project	O
on	O
SourceForge	B-Application
code	O
repository	O
.	O
</s>
