Robustel R3000 NU User Manual

Page 65

Robustel GoRugged R3000 NU User Guide

RT_UG_R3000 NU_v.1.0.0 24.03.2014 64 / 110
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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
NU will be disguised before accessing the remote OpenVPN server.

Disable

Ping Interval

Set ping interval to check if the tunnel is active.

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