# /etc/protocols:
ip	0	IP
icmp	1	ICMP
igmp	2	IGMP
ggp	3	GGP
ipencap	4	IP-ENCAP
st	5	ST
tcp	6	TCP
egp	8	EGP
pup	12	PUP
udp	17	UDP
hmp	20	HMP
xns-idp	22	XNS-IDP
rdp	27	RDP
iso-tp4	29	ISO-TP4
xtp	36	XTP
ddp	37	DDP
idpr-cmtp	39	IDPR-CMTP
ipv6	41	IPv6
ipv6-route	43	IPv6-Route
ipv6-frag	44	IPv6-Frag
ipv6-crypt	50	IPv6-Crypt
ipv6-auth	51	IPv6-Auth
ipv6-icmp	58	IPv6-ICMP
ipv6-nonxt	59	IPv6-NoNxt
ipv6-opts	60	IPv6-Opts
rspf	73	RSPF
vmtp	81	VMTP
ospf	89	OSPFIGP
ipip	94	IPIP
encap	98	ENCAP