Index: sys/netinet/tcp_subr.c
===================================================================
--- sys/netinet/tcp_subr.c
+++ sys/netinet/tcp_subr.c
@@ -1503,19 +1503,20 @@
 
 	tcp_fastopen_init();
 
+	V_tcp_msl = TCPTV_MSL;
+
 	/* Skip initialization of globals for non-default instances. */
 	if (!IS_DEFAULT_VNET(curvnet))
 		return;
 
 	tcp_reass_global_init();
 
-	/* XXX virtualize those bellow? */
+	/* XXX virtualize those below? */
 	tcp_delacktime = TCPTV_DELACK;
 	tcp_keepinit = TCPTV_KEEP_INIT;
 	tcp_keepidle = TCPTV_KEEP_IDLE;
 	tcp_keepintvl = TCPTV_KEEPINTVL;
 	tcp_maxpersistidle = TCPTV_KEEP_IDLE;
-	tcp_msl = TCPTV_MSL;
 	tcp_rexmit_initial = TCPTV_RTOBASE;
 	if (tcp_rexmit_initial < 1)
 		tcp_rexmit_initial = 1;
Index: sys/netinet/tcp_timer.h
===================================================================
--- sys/netinet/tcp_timer.h
+++ sys/netinet/tcp_timer.h
@@ -195,7 +195,6 @@
 extern int tcp_rexmit_initial;
 extern int tcp_rexmit_min;
 extern int tcp_rexmit_slop;
-extern int tcp_msl;
 extern int tcp_ttl;			/* time to live for TCP segs */
 extern int tcp_backoff[];
 extern int tcp_totbackoff;
@@ -212,6 +211,8 @@
 #define	V_tcp_pmtud_blackhole_mss	VNET(tcp_pmtud_blackhole_mss)
 VNET_DECLARE(int, tcp_v6pmtud_blackhole_mss);
 #define V_tcp_v6pmtud_blackhole_mss	VNET(tcp_v6pmtud_blackhole_mss)
+VNET_DECLARE(int, tcp_msl);
+#define V_tcp_msl			VNET(tcp_msl)
 
 void tcp_inpinfo_lock_del(struct inpcb *inp, struct tcpcb *tp);
 
Index: sys/netinet/tcp_timer.c
===================================================================
--- sys/netinet/tcp_timer.c
+++ sys/netinet/tcp_timer.c
@@ -117,10 +117,10 @@
     &tcp_delacktime, 0, sysctl_msec_to_ticks, "I",
     "Time before a delayed ACK is sent");
 
-int	tcp_msl;
+VNET_DEFINE(int, tcp_msl);
 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl,
-    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
-    &tcp_msl, 0, sysctl_msec_to_ticks, "I",
+    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT,
+    &VNET_NAME(tcp_msl), 0, sysctl_msec_to_ticks, "I",
     "Maximum segment lifetime");
 
 int	tcp_rexmit_initial;
Index: sys/netinet/tcp_timewait.c
===================================================================
--- sys/netinet/tcp_timewait.c
+++ sys/netinet/tcp_timewait.c
@@ -749,7 +749,7 @@
 	TW_WLOCK(V_tw_lock);
 	if (rearm)
 		TAILQ_REMOVE(&V_twq_2msl, tw, tw_2msl);
-	tw->tw_time = ticks + 2 * tcp_msl;
+	tw->tw_time = ticks + 2 * V_tcp_msl;
 	TAILQ_INSERT_TAIL(&V_twq_2msl, tw, tw_2msl);
 	TW_WUNLOCK(V_tw_lock);
 }