https://learn.microsoft.com/en-us/windows/win32/api/ws2ipdef/ns-ws2ipdef-in6_pktinfo
IN6_PKTINFO (ws2ipdef.h) - Win32 apps | Microsoft Learn
The in6_pktinfo structure is used to store received IPv6 packet address information, and is used by Windows to return information about received packets and...
happsmicrosoftlearn
https://krbdev.mit.edu/rt/Ticket/Display.html?id=8348
#8348: Remove workaround when binding to udp addresses and pktinfo isn't supported by the system
https://reports.kea.isc.org/dev_guide/d8/dbb/pktinfo__utilities_8h_source.html
Kea: pktinfo_utilities.h Source File
keautilitieshsourcefile