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kevinveenbirkenbachandClaude Opus 5.5
8d5eac6bbf
automtu searched the path MTU between its payload bounds, and a lost echo during that search moved the result between 1400 and 1398 from one deploy to the next. Every move changed the daemon MTU, rewrote daemon.json and restarted dockerd. The probe window is now a single payload: the smaller of 1500 and the egress MTU automtu reads itself (`--print-mtu egress`), minus the 28 bytes of IP and ICMP header, with `--pmtu-policy max` so one target answering at that size decides. registry-1.docker.io leaves the targets because it does not answer ICMP echo. The assert now names both the egress and the effective value. Local repeat deploy: the probe took 0.83 s and no handler restarted dockerd. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>