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8044b40c82
A failed IPV6_RECVTCLASS probe disabled ECN RX entirely, taking down working IPv4 (v4-mapped) delivery with it, while the opposite failure already only degraded. Treat both directions the same: each family degrades to Not-ECT independently, and only a full-family failure turns the cmsg parsing off. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014ugV2edVqoz3tBvq9J6yWp