Implement PKTS_BETWEEN_PROBES for PMTUD#2514
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Add configurable spacing between PMTUD probes. When configured, PMTUD waits until the given number of non-probe packets has been sent before allowing the next probe. When configured, this prevents lost probes on idle connections from inflating the in-flight byte count, triggering PTO, and causing further probes. Without spacing, this can create a self-reinforcing loop that escalates the PTO exponent and generates unnecessary traffic.
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Add configurable spacing between PMTUD probes. When configured, PMTUD waits until the given number of non-probe packets has been sent before allowing the next probe.
This prevents lost probes on idle connections from inflating the in-flight byte count, triggering PTO, and causing further probes. Without spacing, this can create a self-reinforcing loop that escalates the PTO exponent and generates unnecessary traffic.