diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -383,7 +383,7 @@
 		}
 		TCPT_RANGESET(tp->t_rxtcur,
 		    ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1,
-		    tp->t_rttmin, TCPTV_REXMTMAX);
+		    tp->t_rttmin, tcp_rexmit_max);
 	}
 	if (metrics.hc_ssthresh) {
 		/*
@@ -3732,7 +3732,7 @@
 	 * the minimum feasible timer (which is 2 ticks).
 	 */
 	TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp),
-		      max(tp->t_rttmin, rtt + 2), TCPTV_REXMTMAX);
+	    max(tp->t_rttmin, rtt + 2), tcp_rexmit_max);
 
 	/*
 	 * We received an ack for a packet that wasn't retransmitted;
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c
--- a/sys/netinet/tcp_subr.c
+++ b/sys/netinet/tcp_subr.c
@@ -1052,7 +1052,8 @@
 	if (tp->t_rxtshift == 0)
 		tp->t_rxtcur = rexmt;
 	else
-		TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin, TCPTV_REXMTMAX);
+		TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin,
+		    tcp_rexmit_max);
 
 	/*
 	 * Nothing to do for ESTABLISHED or LISTEN states. And, we don't
@@ -1478,6 +1479,7 @@
 	tcp_rexmit_min = TCPTV_MIN;
 	if (tcp_rexmit_min < 1)
 		tcp_rexmit_min = 1;
+	tcp_rexmit_max = TCPTV_REXMTMAX;
 	tcp_persmin = TCPTV_PERSMIN;
 	tcp_persmax = TCPTV_PERSMAX;
 	tcp_rexmit_slop = TCPTV_CPU_VAR;
diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c
--- a/sys/netinet/tcp_syncache.c
+++ b/sys/netinet/tcp_syncache.c
@@ -442,7 +442,7 @@
 	else
 		TCPT_RANGESET(rexmt,
 		    tcp_rexmit_initial * tcp_backoff[sc->sc_rxmits],
-		    tcp_rexmit_min, TCPTV_REXMTMAX);
+		    tcp_rexmit_min, tcp_rexmit_max);
 	sc->sc_rxttime = ticks + rexmt;
 	sc->sc_rxmits++;
 	if (TSTMP_LT(sc->sc_rxttime, sch->sch_nextc)) {
diff --git a/sys/netinet/tcp_timer.h b/sys/netinet/tcp_timer.h
--- a/sys/netinet/tcp_timer.h
+++ b/sys/netinet/tcp_timer.h
@@ -165,6 +165,7 @@
 extern int tcp_maxpersistidle;
 extern int tcp_rexmit_initial;
 extern int tcp_rexmit_min;
+extern int tcp_rexmit_max;
 extern int tcp_rexmit_slop;
 extern int tcp_ttl;			/* time to live for TCP segs */
 extern int tcp_backoff[];
diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c
--- a/sys/netinet/tcp_timer.c
+++ b/sys/netinet/tcp_timer.c
@@ -119,6 +119,11 @@
     &tcp_rexmit_min, 0, sysctl_msec_to_ticks, "I",
     "Minimum Retransmission Timeout");
 
+int	tcp_rexmit_max;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_max, CTLTYPE_INT | CTLFLAG_RW,
+    &tcp_rexmit_max, 0, sysctl_msec_to_ticks, "I",
+    "Maximum Retransmission Timeout");
+
 int	tcp_rexmit_slop;
 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, rexmit_slop, CTLTYPE_INT | CTLFLAG_RW,
     &tcp_rexmit_slop, 0, sysctl_msec_to_ticks, "I",
@@ -618,8 +623,7 @@
 		rexmt = tcp_rexmit_initial * tcp_backoff[tp->t_rxtshift];
 	else
 		rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
-	TCPT_RANGESET(tp->t_rxtcur, rexmt,
-		      tp->t_rttmin, TCPTV_REXMTMAX);
+	TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin, tcp_rexmit_max);
 
 	/*
 	 * We enter the path for PLMTUD if connection is established or, if