#value_indexed
IP_TOS			1
IP_TTL			2
IP_HDRINCL		3
IP_OPTIONS		4
IP_ROUTER_ALERT		5
IP_RECVOPTS		6
IP_RETOPTS		7
IP_PKTINFO		8
IP_PKTOPTIONS		9
IP_MTU_DISCOVER		10
IP_RECVERR		11
IP_RECVTTL		12
IP_RECVTOS		13
IP_MTU			14
IP_FREEBIND		15
IP_IPSEC_POLICY		16
IP_XFRM_POLICY		17
IP_PASSSEC		18
IP_TRANSPARENT		19
IP_ORIGDSTADDR		20
IP_MINTTL		21
IP_NODEFRAG		22
IP_CHECKSUM		23
IP_BIND_ADDRESS_NO_PORT	24
IP_RECVFRAGSIZE		25
IP_RECVERR_RFC4884	26
IP_MULTICAST_IF		32
IP_MULTICAST_TTL	33
IP_MULTICAST_LOOP	34
IP_ADD_MEMBERSHIP	35
IP_DROP_MEMBERSHIP	36
IP_UNBLOCK_SOURCE	37
IP_BLOCK_SOURCE		38
IP_ADD_SOURCE_MEMBERSHIP	39
IP_DROP_SOURCE_MEMBERSHIP	40
IP_MSFILTER		41
MCAST_JOIN_GROUP	42
MCAST_BLOCK_SOURCE	43
MCAST_UNBLOCK_SOURCE	44
MCAST_LEAVE_GROUP	45
MCAST_JOIN_SOURCE_GROUP	46
MCAST_LEAVE_SOURCE_GROUP	47
MCAST_MSFILTER		48
IP_MULTICAST_ALL	49
IP_UNICAST_IF		50