常用上层协议的字段值

是IPv4的上层协议的字段值，也是IPv6的下一个首部协议的值，标识该数据报的载荷内容该交给哪个协议处理，作用类似于端口号，协议号是网络层与运输层的粘合剂，端口号是运输层与应用层的粘合剂

内容来源：https://en.wikipedia.org/wiki/List_of_IP_protocol_numbers

十六进制	字段值	协议
0x00	0	HOPOPT
0x01	1	ICMP
0x02	2	IGMP
0x03	3	GGP
0x04	4	IP-in-IP
0x05	5	ST
0x06	6	TCP
0x07	7	CBT
0x08	8	EGP
0x09	9	IGP
0x0A	10	BBN-RCC-MON
0x0B	11	NVP-II
0x0C	12	PUP
0x0D	13	ARGUS
0x0E	14	EMCON
0x0F	15	XNET
0x10	16	CHAOS
0x11	17	UDP
0x12	18	MUX
0x13	19	DCN-MEAS
0x14	20	HMP
0x15	21	PRM
0x16	22	XNS-IDP
0x17	23	TRUNK-1
0x18	24	TRUNK-2
0x19	25	LEAF-1
0x1A	26	LEAF-2
0x1B	27	RDP
0x1C	28	IRTP
0x1D	29	ISO-TP4
0x1E	30	NETBLT
0x1F	31	MFE-NSP
0x20	32	MERIT-INP
0x21	33	DCCP
0x22	34	3PC
0x23	35	IDPR
0x24	36	XTP
0x25	37	DDP
0x26	38	IDPR-CMTP
0x27	39	TP++
0x28	40	IL
0x29	41	IPv6
0x2A	42	SDRP
0x2B	43	IPv6-Route
0x2C	44	IPv6-Frag
0x2D	45	IDRP
0x2E	46	RSVP
0x2F	47	GRE
0x30	48	DSR
0x31	49	BNA
0x32	50	ESP
0x33	51	AH
0x34	52	I-NLSP
0x35	53	SwIPe
0x36	54	NARP
0x37	55	MOBILE
0x38	56	TLSP
0x39	57	SKIP
0x3A	58	IPv6-ICMP
0x3B	59	IPv6-NoNxt
0x3C	60	IPv6-Opts
0x3D	61
0x3E	62	CFTP
0x3F	63
0x40	64	SAT-EXPAK
0x41	65	KRYPTOLAN
0x42	66	RVD
0x43	67	IPPC
0x44	68
0x45	69	SAT-MON
0x46	70	VISA
0x47	71	IPCU
0x48	72	CPNX
0x49	73	CPHB
0x4A	74	WSN
0x4B	75	PVP
0x4C	76	BR-SAT-MON
0x4D	77	SUN-ND
0x4E	78	WB-MON
0x4F	79	WB-EXPAK
0x50	80	ISO-IP
0x51	81	VMTP
0x52	82	SECURE-VMTP
0x53	83	VINES
0x54	84	TTP
0x54	84	IPTM
0x55	85	NSFNET-IGP
0x56	86	DGP
0x57	87	TCF
0x58	88	EIGRP
0x59	89	OSPF
0x5A	90	Sprite-RPC
0x5B	91	LARP
0x5C	92	MTP
0x5D	93	AX.25
0x5E	94	OS
0x5F	95	MICP
0x60	96	SCC-SP
0x61	97	ETHERIP
0x62	98	ENCAP
0x63	99
0x64	100	GMTP
0x65	101	IFMP
0x66	102	PNNI
0x67	103	PIM
0x68	104	ARIS
0x69	105	SCPS
0x6A	106	QNX
0x6B	107	A/N
0x6C	108	IPComp
0x6D	109	SNP
0x6E	110	Compaq-Peer
0x6F	111	IPX-in-IP
0x70	112	VRRP
0x71	113	PGM
0x72	114
0x73	115	L2TP
0x74	116	DDX
0x75	117	IATP
0x76	118	STP
0x77	119	SRP
0x78	120	UTI
0x79	121	SMP
0x7A	122	SM
0x7B	123	PTP
0x7C	124	IS-IS over IPv4
0x7D	125	FIRE
0x7E	126	CRTP
0x7F	127	CRUDP
0x80	128	SSCOPMCE
0x81	129	IPLT
0x82	130	SPS
0x83	131	PIPE
0x84	132	SCTP
0x85	133	FC
0x86	134	RSVP-E2E-IGNORE
0x87	135	Mobility Header
0x88	136	UDPLite
0x89	137	MPLS-in-IP
0x8A	138	manet
0x8B	139	HIP
0x8C	140	Shim6
0x8D	141	WESP
0x8E	142	ROHC
0x8F	143	Ethernet
0x90	144	AGGFRAG
0x91	145	NSH
0x92-0xFC	146-252	Unassigned
0xFD-0xFE	253-254	Use for experimentation and testing