IP6F_RESERVED_MASK  249 netinet/ip6.h  #define IP6F_RESERVED_MASK	0x0006	/* reserved bits in ip6f_offlg */
IP6F_RESERVED_MASK  253 netinet/ip6.h  #define IP6F_RESERVED_MASK	0x0600	/* reserved bits in ip6f_offlg */