3 ms·
The message header hasn't been fully exhausted yet. Beyond the spare bit[1] in the header there is unassigned OPCODE values which can be used to bend the format
by oripring 8y ago
The message header hasn't been fully exhausted yet. Beyond the spare bit[1] in the header there is unassigned OPCODE values which can be used to bend the format in new ways[2].
1] It was briefly used experimentally if I recall
2] https://tools.ietf.org/html/draft-ietf-dnsop-session-signal https://tools.ietf.org/html/draft-ietf-dnsop-session-signal