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Without PMTU probing, wg MTU should be base_mtu - overhead (clamped by min).
With base=1500, overhead=80 ⇒ wg_mtu=1420.
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base_mtu forced=1452; PMTU results: 1452, 1420 -> policy=min => 1420 chosen.
effective=min(1452,1420)=1420; wg_mtu=1420-80=1340
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If all PMTU probes fail, fall back to base MTU (1500) => wg_mtu=1420.
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