Very similar issue as the last post I had here with communicating our Linux Gateway to an AB CompactLogix controller. I have assigned a gateway address to the controller and assigned that same address to our Linux Gateway. Able to ping with no problem only difference here is that I have not power cycled the PLC as they are currently running. There is also no switch involved on the PLC side looks like the ethernet cable is connected directly to port one on the controller. Any ideas before I power cycle? This unit is only a LAN set up fyi.