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The MTU, from 576 to 9000, on the three-appliance bench

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.

The whole page, with how it was taken and what it does not show: The MTU, from 576 to 9000, on the three-appliance bench.

Discussion

The discussion of this page is held in the project's GitHub Discussions. Showing it here loads giscus from giscus.app and GitHub, and writing in it needs a GitHub account - what that means.