Robustel
GoRugged
R3000
‐
3P
‐
GPS
User
Guide
RT_UG_R3000_v.2.0.3
10.12.2014
73
/
129
Interface
Select
from
“tun”
and
“tap”
which
are
two
different
kinds
of
device
interface
for
OpenVPN.
The
difference
between
tun
and
tap
device
is
this:
a
tun
device
is
a
virtual
IP
point
‐
to
‐
point
device
and
a
tap
device
is
a
virtual
Ethernet
device.
tun
Authentication
Select
from
four
different
kinds
of
authentication
ways:
“Pre
‐
shared”,
“Username/Password”,
“X.509
cert”
and
“X.509
cert+user”.
None
Local
IP
Define
the
local
IP
address
of
OpenVPN
tunnel.
10.8.0.2
Remote
IP
Define
the
remote
IP
address
of
OpenVPN
tunnel.
10.8.0.1
Enable
NAT
Tick
to
enable
SNAT
for
OpenVPN.
The
source
IP
address
of
host
Behind
R3000
will
be
disguised
before
accessing
the
remote
OpenVPN
server.
Disable
Ping
Interval
Set
ping
interval
to
check
if
the
tunnel
is
active.
20
Ping
‐
Restart
Restart
to
establish
the
OpenVPN
tunnel
if
ping
always
timeout
during
this
time.
120
Compression
Select
“LZO”
to
use
the
LZO
compression
library
to
compress
the
data
stream.
LZO
Encryption
Select
from
“BF
‐
CBC”,
“DES
‐
CBC”,
“DES
‐
EDE3
‐
CBC”,
“AES128
‐
CBC”,
“AES192
‐
CBC”
and
“AES256
‐
CBC”.
BF
‐
CBC:
Uses
the
BF
algorithm
in
CBC
mode
and
128
‐
bit
key.
DES
‐
CBC:
Uses
the
DES
algorithm
in
CBC
mode
and
64
‐
bit
key.
DES
‐
EDE3
‐
CBC:
Uses
the
3DES
algorithm
in
CBC
mode
and
192
‐
bit
key.
AES128
‐
CBC:
Uses
the
AES
algorithm
in
CBC
mode
and
128
‐
bit
key.
AES192
‐
CBC:
Uses
the
AES
algorithm
in
CBC
mode
and
192
‐
bit
key.
AES256
‐
CBC:
Uses
the
AES
algorithm
in
CBC
mode
and
256
‐
bit
key.
BF
‐
CBC
MTU
Maximum
Transmission
Unit.
It
is
the
identifier
of
the
maximum
size
of
packet,
which
is
possible
to
transfer
in
a
given
environment.
1500
Max
Frame
Size
Set
the
Max
Frame
Size
for
transmission.
1500
Verbose
Level
Select
the
log
output
level
which
from
low
to
high:
“ERR”,
“WARNING”,
“NOTICE”
and
“DEBUG”.
The
higher
level
will
output
more
log
information.
ERR
Expert
Options
You
can
enter
some
other
PPP
initialization
strings
in
this
field.
Each
string
can
be
separated
by
a
space.
Null
Subnet&Subnet
Mask@Local
Route
Set
the
subnet
and
subnet
Mask
of
local
route.
Null
