PR_SLOWHZ
#define TCPTV_MSL (30*PR_SLOWHZ) /* max seg lifetime (hah!) */
#define TCPTV_SRTTDFLT (3*PR_SLOWHZ) /* assumed RTT if no info */
#define TCPTV_PERSMIN (5*PR_SLOWHZ) /* retransmit persistance */
#define TCPTV_PERSMAX (60*PR_SLOWHZ) /* maximum persist interval */
#define TCPTV_KEEP_INIT (75*PR_SLOWHZ) /* initial connect keep alive */
#define TCPTV_KEEP_IDLE (120*60*PR_SLOWHZ) /* dflt time before probing */
#define TCPTV_KEEPINTVL (75*PR_SLOWHZ) /* default probe interval */
#define TCPTV_MIN (1*PR_SLOWHZ) /* minimum allowable value */
#define TCPTV_REXMTMAX (64*PR_SLOWHZ) /* max allowable REXMT value */