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XPort AR User Guide 120
7: Tunneling
Serial tunneling allows for devices to communicate over a network, without the
realization of other devices connecting between them. Tunneling parameters are
configured using the Web Manager’s Tunnel 1 and Tunnel 2 Settings (on page 28)
or Command Mode’s Tunnel Menu (on page 107).
The XPort AR supports 2 tunneling connections simultaneously per serial port. One
of these connections is Connect Mode, the other connection is Accept Mode. The
connections on one serial port are separate from those on the other serial port.
Connect Mode: the XPort AR actively makes a connection. The receiving node
on the network must listen for the Connect Mode’s connection. Connect Mode is
disabled by default.
Accept Mode: the XPort AR listens for a connection. A node on the network
initiates the connection. Accept Mode is enabled by default.
Disconnect Mode: this mode defines how an open connection stops the
forwarding of data. The specific parameters to stop the connection are
configurable. Once the XPort AR’s Disconnect Mode observes the defined event
occur, it will disconnect both Accept Mode and Connect Mode connections on
that port.
When any character comes in through the serial port, it gets copied to both the
Connect Mode connection and the Accept Mode connection (if both are active).
Connect Mode
For Connect Mode to function, it must be enabled, have a remote station (node)
configured, and a remote port configured (TCP or UDP). When enabled, Connect
Mode is always on.
Enter the remote station as an IP address or DNS name. The XPort AR will not
make a connection unless it can resolve the address. For DNS names, after 4 hours
of an active connection, the XPort AR will re-evaluate the address. If it is a different
address, it will close the connection.
Connect Mode supports the following protocols:
TCP
AES encryption over UDP
AES encryption over TCP
SSH (the XPort AR is the SSH client)
UDP (available only in Connect Mode since it is a connectionless protocol).