Index: sys/net/if_arp.h
===================================================================
--- sys/net/if_arp.h
+++ sys/net/if_arp.h
@@ -105,8 +105,9 @@
 	uint64_t rxrequests;	/* # of ARP requests received by this host. */
 	uint64_t rxreplies;	/* # of ARP replies received by this host. */
 	uint64_t received;	/* # of ARP packets received by this host. */
+	uint64_t txerrors;	/* # of ARP requests failed to send. */
 
-	uint64_t arp_spares[4];	/* For either the upper or lower half. */
+	uint64_t arp_spares[3];	/* For either the upper or lower half. */
 	/* Abnormal event and error  counting: */
 	uint64_t dropped;	/* # of packets dropped waiting for a reply. */
 	uint64_t timeouts;	/* # of times with entries removed */
Index: sys/netinet/if_ether.c
===================================================================
--- sys/netinet/if_ether.c
+++ sys/netinet/if_ether.c
@@ -161,8 +161,15 @@
     "Number of times to retransmit GARP packets;"
     " 0 to disable, maximum of 16");
 
+VNET_DEFINE_STATIC(int, arp_log_level) = LOG_INFO;	/* Min. log(9) level. */
+#define	V_arp_log_level		VNET(arp_log_level)
+SYSCTL_INT(_net_link_ether_arp, OID_AUTO, log_level, CTLFLAG_VNET | CTLFLAG_RW,
+	&VNET_NAME(arp_log_level), 0,
+	"Minimum log(9) level for recording rate limited arp log messages. "
+	"The higher will be log more (emerg=0, info=6 (default), debug=7).");
 #define	ARP_LOG(pri, ...)	do {					\
-	if (ppsratecheck(&arp_lastlog, &arp_curpps, arp_maxpps))	\
+	if ((pri) <= V_arp_log_level &&					\
+	    ppsratecheck(&arp_lastlog, &arp_curpps, arp_maxpps))	\
 		log((pri), "arp: " __VA_ARGS__);			\
 } while (0)
 
@@ -428,9 +435,11 @@
 	m_clrprotoflags(m);	/* Avoid confusing lower layers. */
 	error = (*ifp->if_output)(ifp, m, &sa, &ro);
 	ARPSTAT_INC(txrequests);
-	if (error)
+	if (error) {
+		ARPSTAT_INC(txerrors);
 		ARP_LOG(LOG_DEBUG, "Failed to send ARP packet on %s: %d\n",
 		    if_name(ifp), error);
+	}
 	return (error);
 }
 
Index: usr.bin/netstat/inet.c
===================================================================
--- usr.bin/netstat/inet.c
+++ usr.bin/netstat/inet.c
@@ -1044,6 +1044,7 @@
 	xo_emit("\t" m, (uintmax_t)arpstat.f, pluralies(arpstat.f))
 
 	p(txrequests, "{:sent-requests/%ju} {N:/ARP request%s sent}\n");
+	p(txerrors, "{:sent-failures/%ju} {N:/ARP request%s failed to sent}\n");
 	p2(txreplies, "{:sent-replies/%ju} {N:/ARP repl%s sent}\n");
 	p(rxrequests, "{:received-requests/%ju} "
 	    "{N:/ARP request%s received}\n");