IPPROTO_IDP        42 include/uapi/linux/in.h   IPPROTO_IDP = 22,		/* XNS IDP protocol			*/
IPPROTO_IDP        43 include/uapi/linux/in.h #define IPPROTO_IDP		IPPROTO_IDP
IPPROTO_IDP        43 include/uapi/linux/in.h #define IPPROTO_IDP		IPPROTO_IDP