+#define MF 16
+
+#define AUX_INIT 1
+#define AUX_FRAME 2
+#define AUX_SAK 3
+#define AUX_TIMESTAMP 4
+
+#define NSACKS 4
+#define DEFAULT_SNDBUFSIZE 4096
+#define DEFAULT_MAXSNDBUFSIZE 131072
+#define DEFAULT_RCVBUFSIZE 0
+#define DEFAULT_MAXRCVBUFSIZE 131072
+
+#define MAX_UNRELIABLE_SIZE 65536
+#define DEFAULT_MTU 1000
+
+#define USEC_PER_SEC 1000000L
+#define NSEC_PER_SEC 1000000000L
+#define DEFAULT_USER_TIMEOUT 60
+#define START_RTO (1 * USEC_PER_SEC)
+#define MAX_RTO (3 * USEC_PER_SEC)