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Connections are automatically closed a machine when it detects that the
connection has been idle for a long time. Error packets are generated when
packets are received containing a connection id for one that has been closed.
Questions/Comments
Should the request and reply flags be replaced with a single direction flag?
Should a newly opened connection ID come back as a well-formed control packet with its own control packet opcode?
The server's history list is not sufficient. Do we need it?
For example, read responses will use large amounts of memory and take very little work to recreate.