IP 包类型

enum
{
    IPPROTO_IP        = 0,    //    Dummy protocol for TCP.
    IPPROTO_HOPOPTS        = 0,    //    IPv6 Hop-by-Hop options.
    IPPROTO_ICMP        = 1,    //    Internet Control Message Protocol.
    IPPROTO_IGMP        = 2,    //    Internet Group Management Protocol.
    IPPROTO_IPIP        = 4,    //    IPIP tunnels (older KA9Q tunnels use 94).
    IPPROTO_TCP        = 6,    //    Transmission Control Protocol.
    IPPROTO_EGP        = 8,    //    Exterior Gateway Protocol.
    IPPROTO_PUP        = 12,    //    PUP protocol.
    IPPROTO_UDP        = 17,    //    User Datagram Protocol.
    IPPROTO_IDP        = 22,    //    XNS IDP protocol.
    IPPROTO_TP        = 29,    //    SO Transport Protocol Class 4.
    IPPROTO_IPV6        = 41,    //    IPv6 header.
    IPPROTO_ROUTING        = 43,    //    IPv6 routing header.
    IPPROTO_FRAGMENT    = 44,    //    IPv6 fragmentation header.
    IPPROTO_RSVP        = 46,    //    Reservation Protocol.
    IPPROTO_GRE        = 47,    //    General Routing Encapsulation.
    IPPROTO_ESP        = 50,    //    encapsulating security payload.
    IPPROTO_AH        = 51,    //    authentication header.
    IPPROTO_ICMPV6        = 58,    //    ICMPv6.
    IPPROTO_NONE        = 59,    //    IPv6 no next header.
    IPPROTO_DSTOPTS        = 60,    //    IPv6 destination options.
    IPPROTO_MTP        = 92,    //    Multicast Transport Protocol.
    IPPROTO_ENCAP        = 98,    //    Encapsulation Header.
    IPPROTO_PIM        = 103,    //    Protocol Independent Multicast.
    IPPROTO_COMP        = 108,    //    Compression Header Protocol.
    IPPROTO_RAW        = 255,    //    Raw IP packets.
    IPPROTO_MAX
};