Ssh Pad Mode - Sierra Wireless AirLink ES440 User Manual

ALEOS 4.4.0 Software Configuration User Guide
SSHD
22
PAD
server
12345
74.198.207.51
AirLink device (server)
28

SSH PAD Mode

SSH PAD mode allows a PAD mode TCP connection to be encrypted using an
SSH tunnel and a serial connection to the router or other connected device.
Figure 2-15 shows the network configuration.
Network
Serial connection
to the AirLink device
Router or other
connected device
Figure 2-15: SSH Network
Note: For the purpose of illustration, this user guide uses port 12345 on the client, the
default port 22 for creating an SSH section, and PuTTY as the SSH client throughout.
When configuring SSH PAD mode, you can use any SSH client and values that are appro-
priate for your network.
The main steps in establishing a secure connection are:
1. Configure an SSH tunnel (on port 12345 in this example) on the client using
an SSH client such as PuTTY.
2. Using the SSH client configuration to create the tunnel, log into the AirLink
device with the user name and password. The SSH server authenticates the
user.
3. The client application that wants to communicate with the PAD server on the
AirLink device connects to "localhost" on port 12345.
4. Any data sent on this connection is tagged with a destination port of 12345.
5. The data is received by the SSH server on the AirLink device.
6. The SSH server receives the data with the tag of 12345 and uses port
forwarding to send the data to the PAD server.
SSH
client
(PuTTY)
Port: 12345
client
localhost
208.81.123.30
Client
4116359