Description
Join high and low octets in network order.
Packet headers encode several meanings in fixed-width fields. Bit positions, network byte order, and reserved values must be distinguished from validation of an entire message.
Join high and low octets in network order.
When to use this tool
Use IPv6 Routeralert Option Value Field when you need to decode or encode one explicit packet field.
How to use the tool and how it works
- Enter high, low. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read value, knownLabel. Use the output convention below.
Join high and low octets in network order. Label values 0, 1, and 2 as mld, rsvp, and active-networks; classify all others as unassigned-or-other.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| high | High | Required. Safe integer; minimum 0; maximum 255. |
| low | Low | Required. Safe integer; minimum 0; maximum 255. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| value | Value | Required. Safe integer. |
| knownLabel | Known Label | Required. Text; maximum UTF-16 length 8192. |
{
"input": {
"high": 0,
"low": 0
},
"output": {
"value": 0,
"knownLabel": "mld"
}
}Limitations and assumptions
- The fallback combines unrecognized and other assignments; it is not a live registry lookup or option validator.
- 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
Inspect the complete captured header and apply the relevant protocol's structural and state rules.
References
Similar or alternative tools
- DHCP Option Length Octet Field
Require a code from 1 through 254 and a length byte from 0 through 255; return the two-byte header.
- IPv6 Option Action Bits
Decode the top two option-type bits as action and bit five as mutable.