Symbol: IPV6_PATHMTU
usr/src/boot/include/netinet6/in6.h
451
#define IPV6_PATHMTU 44 /* mtuinfo; get the current path MTU (sopt),
usr/src/uts/common/netinet/in.h
1269
#define IPV6_PATHMTU 0x25 /* get the PMTU */