The first measurement of a connection crossing the XGS 136 in its coprocessor's fast path rather than through the host: the same traffic, the same ports, once with the host forwarding it and once with the flow maker on, both ways. Each run was taken in a window of its own and photographed when it finished.
The first measurements with a hardware peer at both ends of every tunnel: until this night the far end of a measured tunnel was a firewall doing ESP in software, so a figure could be that firewall's rather than the appliance's. Every window a number came from was photographed when the run finished, and the pictures are below each table.
Measured 2026-10-17 on the bench: one TCP stream for ten seconds in each
direction, in clear text and through the IPsec tunnels (AES-GCM-256, in the engines at both ends),
at eight MTUs from the smallest to the largest. Every run's window was photographed when it
finished; the 52 pictures are in docs/images/measurements/mtu-2026-10-17/ and below each table.