2 Commits

Include renames

Author	SHA1	Message	Date
mrambossekandClaude Opus 5	d5e15816b5	server: fix egress-MTU probe — connect the socket before reading IP_MTU ... IP_MTU getsockopt returns ENOTCONN on an unconnected socket; the v0.3.4 probe set IP_MTU_DISCOVER and Sendto but never Connect'd, so every probe errored. UDP-connect (no handshake) pins the route so IP_MTU reflects the path; switched to Write (two return values). Sysctl audit already flagged the four real fmr issues in v0.3.4; this makes the MTU proof report. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-07-31 20:46:47 +02:00
mrambossekandClaude Opus 5	4ae744aae5	server: self-test — sysctl audit + egress-MTU self-proof ("server proven good") ... A measurement server must prove its own host isn't distorting results: - sysctl audit (/proc/sys): flags accept_ra on a static host, ICMP redirects, ICMP rate-limiting of the server's own errors, and disabled TCP options — each a measurement-fidelity hazard, with the "why". - egress-MTU self-proof: DF PMTUD probe (IP_MTU_DISCOVER + getsockopt IP_MTU, no root — Linux-only, stub elsewhere) to external anchors. If the server's own uplink is below 1500, client MTU tests measure THIS server, so we say so. Exposed at GET /admin/selftest (full report) and as server_selftest {mtu_ok, sysctl_ok} in the profile so clients can trust or skip MTU tests. Recommended deploy/99-echolot-sysctl.conf + README section. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-07-31 20:44:38 +02:00