#define SI_TF_NONE 0 // tcp flags in the global info applied to each session
#define SI_TF_NODELAY 0x01 // set nagle's off for each connection
#define SI_TF_FASTACK 0x02 // set fast ack on for each connection
+#define SI_TF_QUICK 0x04 // set keepalive for each connection and reduce syn amount while doing connect
#ifndef _SI_ERRNO
extern int SIerrno; // error number set by public routines