Index: sbin/ifconfig/ifconfig.c
===================================================================
RCS file: /cvs/src/sbin/ifconfig/ifconfig.c,v
retrieving revision 1.302
diff -u -p -r1.302 ifconfig.c
--- sbin/ifconfig/ifconfig.c	3 Oct 2015 10:44:23 -0000	1.302
+++ sbin/ifconfig/ifconfig.c	13 Oct 2015 10:06:38 -0000
@@ -181,6 +181,7 @@ void	deletetunnel(const char *, int);
 void	settunnelinst(const char *, int);
 void	settunnelttl(const char *, int);
 void	setvnetid(const char *, int);
+void	delvnetid(const char *, int);
 #ifdef INET6
 void	setia6flags(const char *, int);
 void	setia6pltime(const char *, int);
@@ -413,6 +414,7 @@ const struct	cmd {
 	{ "tunneldomain", NEXTARG,	0,		settunnelinst } ,
 	{ "tunnelttl",	NEXTARG,	0,		settunnelttl } ,
 	{ "vnetid",	NEXTARG,	0,		setvnetid },
+	{ "-vnetid",	0,		0,		delvnetid },
 	{ "pppoedev",	NEXTARG,	0,		setpppoe_dev },
 	{ "pppoesvc",	NEXTARG,	0,		setpppoe_svc },
 	{ "-pppoesvc",	1,		0,		setpppoe_svc },
@@ -2868,7 +2870,7 @@ phys_status(int force)
 
 	if (dstport)
 		printf(":%u", ntohs(dstport));
-	if (ioctl(s, SIOCGVNETID, (caddr_t)&ifr) == 0 && ifr.ifr_vnetid > 0)
+	if (ioctl(s, SIOCGVNETID, (caddr_t)&ifr) == 0)
 		printf(" vnetid %d", ifr.ifr_vnetid);
 	if (ioctl(s, SIOCGLIFPHYTTL, (caddr_t)&ifr) == 0 && ifr.ifr_ttl > 0)
 		printf(" ttl %d", ifr.ifr_ttl);
@@ -3391,7 +3393,7 @@ void
 setvnetid(const char *id, int param)
 {
 	const char *errmsg = NULL;
-	int vnetid;
+	uint32_t vnetid;
 
 	vnetid = strtonum(id, 0, UINT_MAX, &errmsg);
 	if (errmsg)
@@ -3401,6 +3403,14 @@ setvnetid(const char *id, int param)
 	ifr.ifr_vnetid = vnetid;
 	if (ioctl(s, SIOCSVNETID, (caddr_t)&ifr) < 0)
 		warn("SIOCSVNETID");
+}
+
+/* ARGSUSED */
+void
+delvnetid(const char *ignored, int alsoignored)
+{
+	if (ioctl(s, SIOCDVNETID, &ifr) < 0)
+		warn("SIOCDVNETID");
 }
 
 void
Index: sys/net/if.h
===================================================================
RCS file: /cvs/src/sys/net/if.h,v
retrieving revision 1.169
diff -u -p -r1.169 if.h
--- sys/net/if.h	5 Oct 2015 15:19:29 -0000	1.169
+++ sys/net/if.h	13 Oct 2015 10:06:38 -0000
@@ -354,6 +354,7 @@ struct	ifreq {
 		struct	sockaddr	ifru_broadaddr;
 		short			ifru_flags;
 		int			ifru_metric;
+		uint32_t		ifru_vnetid;
 		uint64_t		ifru_media;
 		caddr_t			ifru_data;
 	} ifr_ifru;
@@ -366,7 +367,7 @@ struct	ifreq {
 #define	ifr_hardmtu	ifr_ifru.ifru_metric	/* hardmtu (overload) */
 #define	ifr_media	ifr_ifru.ifru_media	/* media options */
 #define	ifr_rdomainid	ifr_ifru.ifru_metric	/* VRF instance (overload) */
-#define ifr_vnetid	ifr_ifru.ifru_metric	/* Virtual Net Id (overload) */
+#define ifr_vnetid	ifr_ifru.ifru_vnetid	/* Virtual Net Id */
 #define ifr_ttl		ifr_ifru.ifru_metric	/* tunnel TTL (overload) */
 #define	ifr_data	ifr_ifru.ifru_data	/* for use by interface */
 };
Index: sys/net/if_vxlan.c
===================================================================
RCS file: /cvs/src/sys/net/if_vxlan.c,v
retrieving revision 1.30
diff -u -p -r1.30 if_vxlan.c
--- sys/net/if_vxlan.c	12 Oct 2015 10:51:49 -0000	1.30
+++ sys/net/if_vxlan.c	13 Oct 2015 10:06:38 -0000
@@ -80,7 +80,7 @@ int	 vxlan_enable = 0;
 u_long	 vxlan_tagmask;
 
 #define VXLAN_TAGHASHSIZE		 32
-#define VXLAN_TAGHASH(tag)		 (tag & vxlan_tagmask)
+#define VXLAN_TAGHASH(tag)		 ((unsigned int)tag & vxlan_tagmask)
 LIST_HEAD(vxlan_taghash, vxlan_softc)	*vxlan_tagh;
 
 void
@@ -108,7 +108,7 @@ vxlan_clone_create(struct if_clone *ifc,
 	    M_WAITOK|M_ZERO);
 	sc->sc_imo.imo_max_memberships = IP_MIN_MEMBERSHIPS;
 	sc->sc_dstport = htons(VXLAN_PORT);
-	sc->sc_vnetid = 0;
+	sc->sc_vnetid = -1;
 
 	ifp = &sc->sc_ac.ac_if;
 	snprintf(ifp->if_xname, sizeof ifp->if_xname, "vxlan%d", unit);
@@ -420,18 +420,29 @@ vxlanioctl(struct ifnet *ifp, u_long cmd
 		break;
 
 	case SIOCSVNETID:
-		if (ifr->ifr_vnetid < 0 || ifr->ifr_vnetid > 0x00ffffff) {
+		if (ifr->ifr_vnetid > 0x00ffffff) {
 			error = EINVAL;
 			break;
 		}
 		s = splnet();
-		sc->sc_vnetid = (u_int32_t)ifr->ifr_vnetid;
+		sc->sc_vnetid = (int)ifr->ifr_vnetid;
 		(void)vxlan_config(ifp, NULL, NULL);
 		splx(s);
 		break;
 
 	case SIOCGVNETID:
-		ifr->ifr_vnetid = (int)sc->sc_vnetid;
+		if (sc->sc_vnetid == -1) {
+			error = EADDRNOTAVAIL;
+			break;
+		}
+		ifr->ifr_vnetid = (uint32_t)sc->sc_vnetid;
+		break;
+
+	case SIOCDVNETID:
+		s = splnet();
+		sc->sc_vnetid = -1;
+		(void)vxlan_config(ifp, NULL, NULL);
+		splx(s);
 		break;
 
 	default:
@@ -462,7 +473,7 @@ vxlan_lookup(struct mbuf *m, struct udph
 	struct mbuf_list	 ml = MBUF_LIST_INITIALIZER();
 	struct vxlan_softc	*sc = NULL, *sc_cand = NULL;
 	struct vxlan_header	 v;
-	u_int32_t		 vni;
+	int			 vni;
 	struct ifnet		*ifp;
 	int			 skip;
 	struct ether_header	*eh;
@@ -479,14 +490,18 @@ vxlan_lookup(struct mbuf *m, struct udph
 	m_copydata(m, skip, sizeof(v), (caddr_t)&v);
 	skip += sizeof(v);
 
-	vni = ntohl(v.vxlan_id);
-
-	/* Validate header */
-	if ((vni == 0) || (vni & VXLAN_RESERVED2) ||
-	    (ntohl(v.vxlan_flags) != VXLAN_FLAGS_VNI))
+	if (v.vxlan_flags & htonl(VXLAN_RESERVED1) ||
+	    v.vxlan_id & htonl(VXLAN_RESERVED2))
 		return (0);
 
-	vni >>= VXLAN_VNI_S;
+	vni = ntohl(v.vxlan_id) >> VXLAN_VNI_S;
+	if ((v.vxlan_flags & htonl(VXLAN_FLAGS_VNI)) != 0) {
+		if (vni != 0)
+			return (0);
+
+		vni = -1;
+	}
+
 	LIST_FOREACH(sc, &vxlan_tagh[VXLAN_TAGHASH(vni)], sc_entry) {
 		if ((uh->uh_dport == sc->sc_dstport) &&
 		    vni == sc->sc_vnetid &&
@@ -615,8 +630,13 @@ vxlan_output(struct ifnet *ifp, struct m
 #endif
 
 	vi = (struct vxlanudpiphdr *)ui;
-	vi->ui_v.vxlan_flags = htonl(VXLAN_FLAGS_VNI);
-	vi->ui_v.vxlan_id = htonl(sc->sc_vnetid << VXLAN_VNI_S);
+	if (sc->sc_vnetid != -1) {
+		vi->ui_v.vxlan_flags = htonl(VXLAN_FLAGS_VNI);
+		vi->ui_v.vxlan_id = htonl(sc->sc_vnetid << VXLAN_VNI_S);
+	} else {
+		vi->ui_v.vxlan_flags = htonl(0);
+		vi->ui_v.vxlan_id = htonl(0);
+	}
 
 	/* UDP checksum should be 0 */
 	ui->ui_sum = 0;
Index: sys/net/if_vxlan.h
===================================================================
RCS file: /cvs/src/sys/net/if_vxlan.h,v
retrieving revision 1.6
diff -u -p -r1.6 if_vxlan.h
--- sys/net/if_vxlan.h	19 Dec 2014 17:14:40 -0000	1.6
+++ sys/net/if_vxlan.h	13 Oct 2015 10:06:38 -0000
@@ -53,7 +53,7 @@ struct vxlan_softc {
 	struct sockaddr_storage	 sc_dst;
 	in_port_t		 sc_dstport;
 	u_int			 sc_rdomain;
-	u_int32_t		 sc_vnetid;
+	int			 sc_vnetid;
 	u_int8_t		 sc_ttl;
 
 	LIST_ENTRY(vxlan_softc)	 sc_entry;
Index: sys/sys/sockio.h
===================================================================
RCS file: /cvs/src/sys/sys/sockio.h,v
retrieving revision 1.60
diff -u -p -r1.60 sockio.h
--- sys/sys/sockio.h	11 Sep 2015 13:02:28 -0000	1.60
+++ sys/sys/sockio.h	13 Oct 2015 10:06:38 -0000
@@ -194,6 +194,8 @@
 #define SIOCSETMPWCFG	_IOW('i', 173, struct ifreq) /* set mpw config */
 #define SIOCGETMPWCFG	_IOWR('i', 174, struct ifreq) /* get mpw config */
 
+#define SIOCDVNETID	_IOW('i', 175, struct ifreq)	/* del virt net id */
+
 #define	SIOCSVH		_IOWR('i', 245, struct ifreq)	/* set carp param */
 #define	SIOCGVH		_IOWR('i', 246, struct ifreq)	/* get carp param */