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The CGNAT smoke test's OPEN DECISION is made: fleet-wide, permanent, family-agnostic client MTU 1280 (RFC 8200 IPv6-minimum floor), implemented in felhom-agent v0.65.0. - §4.3: OPEN DECISION → made decision + rationale + rejected alternatives (auto-probe/per-type = fragility for a non-metric; MSS-clamp = unneeded). "ships MTU 1420" → 1280; corrected "fixed-line unaffected" (DS-Lite ~1452, PPPoE would also black-hole at 1420 — one floor covers all). - §4.2: 1280 is family-agnostic so MTU correctness is decoupled from v4/v6 resolution; v4-pin noted as a separate optional determinism item. - §3.2 wire-field note + §8 S6 row: MTU 1420 → 1280; S6 residual now only the true-CGNAT-SIM retest. - REPORT.md overwritten. Docs-only; the constant change is in felhom-agent v0.65.0. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6
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felhom.eu — task reports
Overwrite this file with a summary of the most recent task only (uniform with the other repos; not cumulative). The cumulative hub history lives in hub/CHANGELOG.md; the scripts history lives in scripts/CHANGELOG.md.
REPORT — S3.1 doc close-out: offsite-tunnel MTU decision resolved (docs-only) (2026-07-04)
Docs-only companion to the S3.1 implementation (the constant change lives in felhom-agent
v0.65.0 — see that repo's REPORT). Resolves the OPEN DECISION the 2026-07-04 CGNAT smoke test
left in documentation/architecture/06-offsite-connectivity.md §4.3.
Decision recorded: fleet-wide client MTU 1280 (RFC 8200 IPv6-minimum floor; outer 1340 v4 /
1360 v6 fits every realistic path), permanent + family-agnostic, client-only (endpoint wg0
untouched — interface MTU caps box→PBS, advertised MSS caps PBS→box).
Edits to 06-offsite-connectivity.md:
- §4.3 — replaced "OPEN DECISION (not yet made)" with the made decision + rationale + the rejected alternatives (auto-probe/per-connection-type = fragility for a non-metric; MSS-clamp = unneeded without forwarding). Updated "the unit ships explicit MTU 1420" → 1280.
- §4.3 — corrected the over-general "fixed-line customers are unaffected": sub-1500 fixed-line paths (DS-Lite ~1452, some PPPoE) would also have black-holed at 1420; one 1280 floor covers all.
- §4.2 — noted the 1280 floor is chosen family-agnostic specifically so MTU correctness does not depend on the v4/v6 resolution outcome; the deterministic v4-pin stays a separate, optional future determinism note (not built here).
- §3.2 / §8 S6 row — stale "MTU 1420" wire-field note → 1280; S6 residual list drops the now-resolved MTU decision, keeping only the low-risk true-CGNAT-SIM retest.
Not changed: no code, no endpoint, no hub/controller, no JSON golden (MTU is never on the wire). One docs-only commit.