There are many ways of achieving replication (part two[1] describes using both TCP and UDP). System high could for instance stream to system low. I did two-way

There are many ways of achieving replication (part two[1] describes using both TCP and UDP). System high could for instance stream to system low. I did two-way comms (not replication) via diodes once, in which a request was sent to a write-only endpoint, and the response came back from a read-only endpoint, both using UDP. I used correlation Ids (borrowed from message queues) to match a response to a request. It's just asynchronous comms. [1] http://blog.cimation.com/blog/data-diodes-and-security-in-the-real-world http://blog.cimation.com/blog/data-diodes-and-security-in-th...