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Tom, et.al,
Some years ago we had an issue with Moxi switches where, when the Ethernet cable was disconnected and then reconnected, the Rabbit would not detect the presence of the network so you couldn't communicate with it until you power-cycled the Rabbit. These are RCM3900s. This never happened with Netgear switches, which is what we use 98% of the time.
At the time I submitted a tech support ticket to Digi, and they supplied an updated library. I think they tweeked pd_havelink(), and we haven't had a problem since. Until today.
A customer is using a B&B Electronics industrial switch, and they are experiencing the same problem. Disconnect the Ethernet cable, then plug it back in, there is no link light or activity light on switch and you can't communicate with the equipment (Rabbit). If you power-cycle the switch, the connection is restored. And if you power-cycle the Rabbit, the connection is restored. It doesn't matter if we are using DHCP or Static IP.
I don't think this is a Rabbit issue, but is there anything I can do in the Rabbit to correct this? These are layer 2 switches, so there is nothing to configure in switches.
Steve