Description
Decrease hopLimit by one with a floor of zero and set expired when the original value is zero or one.
A wire-format length may count headers, payload, padding, or only part of an enclosing message. Offsets and exclusive ends must use a clearly stated byte convention.
Decrease hopLimit by one with a floor of zero and set expired when the original value is zero or one.
When to use this tool
Use IPv6 Hoplimit Decrement Expiry Flag when you need a field-level byte count or boundary check.
How to use the tool and how it works
- Enter hopLimit. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read remaining, expired. Inspect expired before interpreting the associated values.
Decrease hopLimit by one with a floor of zero and set expired when the original value is zero or one.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| hopLimit | Hop Limit | Required. Safe integer; minimum 0; maximum 255. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| remaining | Remaining | Required. Safe integer. |
| expired | Expired | Required. Boolean. |
{
"input": {
"hopLimit": 1
},
"output": {
"remaining": 0,
"expired": true
}
}Limitations and assumptions
- This models one forwarding step; it does not inspect or forward packets.
- 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
Compare the computed span with the actual captured buffer and validate its contents separately.
References
Similar or alternative tools
- Network: IPv6 Hop Limit Expired Flag
Return forwardable when hopLimit exceeds one.
- IPv6 Routing Segments Left Decrement Budget
Decrease segmentsLeft by one with a floor of zero.