Modem Emulation; Ethernet Bridging - Digi ConnectPort LTS Series User Manual

ConnectPort LTS features

Modem emulation

ConnectPort LTS devices include a configuration profile that allows the device to emulate a modem.
Modem emulation sends and receives modem responses to a serial device over TCP/IP (including
Ethernet) instead of Public Switched Telephone Network (PSTN). The modem emulation profile allows
you to maintain a current software application but using it over the less expensive Ethernet network.
In addition, you can enable or disable telnet processing on the incoming and outgoing modem-
emulation connections. For information on the modem-emulation commands that ConnectPort LTS
products support, see the Digi Connect® Family Command Reference. See
information.

Ethernet bridging

You can use Ethernet bridging to join multiple Ethernet networks together so that the joined
networks appear as one Ethernet network. Ethernet bridging combines an Ethernet interface with
one or more physical Ethernet interfaces under the umbrella of a single bridge interface. The Ethernet
bridge is a software switch that can connect multiple Ethernet interfaces (physical or virtual) on a
single machine while sharing a single IP subnet.
Use the script file, brmode (/etc/init.d/brmode), to enable or disable Ethernet bridging. (Ethernet
bridging is supported only through the command line interface.)
To enable Ethernet bridging, run the following command:
# service brmode start
The IP address of the eth0 interface becomes the common IP address for the bridging mode interface
(br0).
After enabling Ethernet bridging, the eth0 and eth1 addresses disappear. There is a delay of a few
minutes while the system automatically changes the physical interface from the Ethernet 1 port to
Ethernet 2 port.
Note Enable the eth1 (IP address #2) interface before starting Ethernet bridging.
To disable Ethernet bridging, run the following command:
# service brmode stop
To customize Ethernet bridging options, modify /etc/init.d/brmode. See the brctl Linux manpage for
details.
To remove bridging messages from the serial console, run the following command:
# brctl setageing br0 0
To automatically start the Ethernet bridging service at each boot, add the following commands to the
rc.user file:
service brmode start
brtcl set ageing br0 0
For more information on using the rc.user file, see
Digi ConnectPort LTS User Guide
Select Port Profile
Using the rc.user file and the Digi Knowledgebase.
Modem emulation
for more
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