Description
Place secondStart within a signed half-space of firstStart, reject the exact half-space tie, and intersect the resulting half-open intervals.
TCP sequence and timestamp fields wrap in a 32-bit space. A modular distance gives a local displacement; ordering near half the space and multiple wraps requires additional context.
Place secondStart within a signed half-space of firstStart, reject the exact half-space tie, and intersect the resulting half-open intervals.
When to use this tool
Use TCP Retransmission Sequence Overlap when you need a bounded sequence-space distance or interval relationship.
How to use the tool and how it works
- Enter firstStart, firstLength, secondStart, secondLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read overlapBytes, secondOffset. Use the output convention below.
Place secondStart within a signed half-space of firstStart, reject the exact half-space tie, and intersect the resulting half-open intervals. Return nonnegative overlapBytes and secondOffset.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstStart | First Start | Required. Safe integer; minimum 0; maximum 4294967295. |
| firstLength | First Length | Required. Safe integer; minimum 0; maximum 2147483647. |
| secondStart | Second Start | Required. Safe integer; minimum 0; maximum 4294967295. |
| secondLength | Second Length | Required. Safe integer; minimum 0; maximum 2147483647. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| overlapBytes | Overlap Bytes | Required. Safe integer. |
| secondOffset | Second Offset | Required. Safe integer. |
{
"input": {
"firstStart": 4294967290,
"firstLength": 10,
"secondStart": 0,
"secondLength": 8
},
"output": {
"overlapBytes": 4,
"secondOffset": 6
}
}Limitations and assumptions
- Lengths are at most 2^31 - 1; this local interval model does not reconstruct arbitrary multi-wrap streams.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Combine sequence arithmetic with connection state, packet chronology, and explicit wrap epochs where available.
References
Similar or alternative tools
- TCP Sack Block Relative Span
Compute (right - left) modulo 2^32 and require a strictly positive span below 2^31.
- TCP Sequence Halfspace Tie
Calculate the forward distance from first to second modulo 2^32.