TCP Handshake Reconstruction via SYN-ACK Interception

The device performs preliminary actions by sending SYN messages and pre-allocating TCB records before actually needing to track the connection. This allows the device to have TCB records ready in advance, so when SYN-ACK messages arrive, the resources are already prepared and no additional allocation is needed during the waiting period.

The device creates copies of TCB records in advance for potential connections. Instead of creating unique TCB records for each possible connection, it pre-creates a pool of TCB records that can be reused. This copying approach allows rapid assignment of connection tracking resources without wasting memory on connections that never complete the handshake.

The device performs preliminary allocation of TCB records from a pre-created pool before the connection is actually established. This preliminary action separates the resource allocation from the connection establishment timeline, allowing TCB records to be quickly assigned and later released without long-term consumption for failed connections.

The device implements a mechanism to discard TCB records from the pool when they are no longer needed and recover them for reuse. When a SYN-ACK is received or a timeout occurs, the TCB record is discarded from active use and returned to the pool of available records, enabling continuous reuse of limited memory resources rather than allocating new records for each connection attempt.

The device prepares multiple TCB records in advance from a preallocated pool, enabling parallel connection attempts without the overhead of dynamic allocation during each handshake. This preliminary preparation allows the device to rapidly initiate multiple connections while maintaining efficient resource usage, as the TCB records are reused from the pool rather than being continuously allocated and freed.

The device uses copied TCB records from a shared pool to handle multiple parallel connections. Instead of maintaining separate persistent TCB records for each potential connection, it assigns copied records from the pool to active connections and recovers them when done, enabling parallel connection establishment with improved resource efficiency.