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This is a new mode (Dual Mode) for OpenVPN which builds on top of the work which I did previously (Bulk Mode && MTIO Mode). This mode finally allows for the proper separation of the core operations into 2 independent threads (link-read->tunn-send && tunn-read->link-send). It also introduces a new separate session key so that the read thread and send thread have their own non-conflicting key states to work with (PRIMARY && THREAD).
Blog Post: https://fossjon.com/2025/10/30/finally-able-to-insert-a-proper-layer-of-bi-directional-multi-threaded-set-of-core-operations-to-the-highly-modified-openvpn-source-code/