Currently supported by libipsec and PF_KEY on macOS (FreeBSD, like Linux, reports the time the SA was first used in sadb_lifetime_usetime - it also triggers rekeyings based on that, which Linux doesn't, it also triggers them if an SA is never used).
Currently supported by libipsec and PF_KEY on macOS (FreeBSD, like Linux, reports the time the SA was first used in sadb_lifetime_usetime - it also triggers rekeyings based on that, which Linux doesn't, it also triggers them if an SA is never used).