from the Forum department...
Setting up Cellular Modem between PLC
Local and wide area networking in factory automation. topic
Posted by Surajchem on 10 January, 2013 - 11:37 pm
I currently have this network topology.

Host Machine:
USFilter Intra-link LC3000 (IP:
Cisco switch (
Juniper NetScreen-25 firewall ( which is connected to DSL line.

Remote site 1
USFilter DI (
USFilter DO (
Cisco Switch

Remote site 2
USFilter DI (
USFilter DO (
Cisco Switch

Initially, these two remote units were connected to Host PLC through Trango 900Mhz radios. But due to frequency interferences, we are going with cellular modem. We got 5 remote sites and so got 5 cellur modem Sierra wireless modem GX440 4G LTE for remote sites.

what would be the best way to set up the link between them
1) Port forwarding
2) VPN

and if anybody has done it before, how to go about it.

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