RFC790中定義的網絡傳輸用到的常數

#define IPPROTO_IP              0              

#define IPPROTO_HOPOPTS         0              

#define IPPROTO_ICMP            1              

#define IPPROTO_IGMP            2              

#define IPPROTO_GGP             3              

#define IPPROTO_IPV4            4              

#define IPPROTO_TCP             6              

#define IPPROTO_PUP             12             

#define IPPROTO_UDP             17             

#define IPPROTO_IDP             22             

#define IPPROTO_IPV6            41             

#define IPPROTO_ROUTING         43             

#define IPPROTO_FRAGMENT        44             

#define IPPROTO_ESP             50             

#define IPPROTO_AH              51             

#define IPPROTO_ICMPV6          58             

#define IPPROTO_NONE            59             

#define IPPROTO_DSTOPTS         60             

#define IPPROTO_ND              77             

#define IPPROTO_ICLFXBM         78

#define IPPROTO_RAW             255            

#define IPPROTO_MAX             256

#define IPPORT_ECHO             7

#define IPPORT_DISCARD          9

#define IPPORT_SYSTAT           11

#define IPPORT_DAYTIME          13

#define IPPORT_NETSTAT          15

#define IPPORT_FTP              21

#define IPPORT_TELNET           23

#define IPPORT_SMTP             25

#define IPPORT_TIMESERVER       37

#define IPPORT_NAMESERVER       42

#define IPPORT_WHOIS            43

#define IPPORT_MTP              57

#define IPPORT_TFTP             69

#define IPPORT_RJE              77

#define IPPORT_FINGER           79

#define IPPORT_TTYLINK          87

#define IPPORT_SUPDUP           95

#define IPPORT_EXECSERVER       512

#define IPPORT_LOGINSERVER      513

#define IPPORT_CMDSERVER        514

#define IPPORT_EFSSERVER        520

#define IPPORT_BIFFUDP          512

#define IPPORT_WHOSERVER        513

#define IPPORT_ROUTESERVER      520

#define IPPORT_RESERVED         1024

#define IMPLINK_IP              155

#define IMPLINK_LOWEXPER        156

#define IMPLINK_HIGHEXPER       158