Fiber Optic Transceiver ARP Caching
Date Posted: July 01, 2008 01:01 AM
Author: Mel Beckman
Dear Doctor, One interface on our System i box connects to an Ethernet switch that connects through a fiber-optic transceiver (FOT) and cable that runs 3,000 feet to our training center, where another FOT turns the signal back into Cat-5e that plugs in to another Ethernet switch. We sometimes need to unplug PCs from our main building and take them to the training center for special classes. Often when we do this, the PCs won't communicate to our System i server over the fiber, yet they can connect to other Ethernet devices in the training center. I've tried rebooting the switches at either end (and even rebooting i5/OS) with no change. Oddly enough, computers left in the training center overnight always work fine the next day. What gives?

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