6: Networking and Security
EDS4100 4 Port Device Server User Guide 123
Tunneling and the EDS4100
Each EDS4100 serial port supports two concurrent tunneling connections, Connect mode
and Accept mode. These connections operate independently of the other EDS4100 serial
ports.
In Connect mode, the EDS4100 actively makes a connection. The receiving node on
the network must listen for the Connect mode’s connection. By default, Connect
mode is disabled.
In Accept mode, the EDS4100 listens for a connection. A node on the network
initiates the connection. By default, Accept mode is enabled.
Disconnect mode defines how an active connection is disconnected. The parameters
used to drop the connection are user configurable. The EDS4100’s Disconnect mode
disconnects both Accept mode and Connect mode connections on a serial port when
it observes the defined event occur on that port.
When any character arrives through the serial port, it gets copied to both the Connect
mode connection and Accept mode connection if both are active.
Connect Mode
For Connect mode to work:
Connect mode must be enabled on the EDS4100 (see Tunnel – Connect Mode Page
on page 54).
A remote station (node) must be configured for Connect mode.
A remote TCP or UDP port must be configured.
When Connect mode is enabled, it remains on until it is ended by Disconnect mode.
Connect mode supports the following protocols:
TCP
AES encryption over UDP
AES encryption over TCP
SSH (the EDS4100 is the SSH client)
UDP (available only in Connect mode since it is a connectionless protocol)
For AES encryption, both the encrypt key and the decrypt key must be specified. The
encrypt key is used with data sent from the EDS4100, while the decrypt key is used when
the EDS4100 receives data. Both keys can have the same value.
If the remote address or port is not configured for Connect mode using UDP, the
EDS4100 accepts packets from any device on the network and sends packets to the last
device that sent it packets. Therefore, configure the remote address and port. When the
remote port and station are configured, the EDS4100 ignores date from other sources.
To configure SSH, the SSH client username must be configured. In Connect Mode, the
EDS4100 is the SSH client. Ensure the EDS4100’s SSH client username is configured on
the SSH server before using it with the EDS4100.
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