diff --git a/canbusload.c b/canbusload.c
index d2906ae..753d658 100644
--- a/canbusload.c
+++ b/canbusload.c
@@ -65,27 +65,32 @@
 #include "terminal.h"
 #include "canframelen.h"
 
-#define MAXSOCK 16    /* max. number of CAN interfaces given on the cmdline */
+#define ANYDEV "any" /* name of interface to receive from any CAN interface */
+#define MAXDEVS 20   /* max. number of CAN interfaces given on the cmdline */
 
 #define PERCENTRES 5 /* resolution in percent for bargraph */
 #define NUMBAR (100 / PERCENTRES) /* number of bargraph elements */
+#define BRSTRLEN 20
 
 extern int optind, opterr, optopt;
 
 static struct {
 	char devname[IFNAMSIZ + 1];
+	char bitratestr[BRSTRLEN]; /* 100000/2000000 => 100k/2M */
+	char recv_direction;
+	int ifindex;
 	unsigned int bitrate;
 	unsigned int dbitrate;
 	unsigned int recv_frames;
 	unsigned int recv_bits_total;
 	unsigned int recv_bits_payload;
 	unsigned int recv_bits_dbitrate;
-} stat[MAXSOCK + 1];
+} stat[MAXDEVS + 1];
 
 static volatile int running = 1;
 static volatile sig_atomic_t signal_num;
 static int max_devname_len; /* to prevent frazzled device name output */
-static int max_bitrate_len;
+static int max_bitratestr_len;
 static int currmax;
 static unsigned char redraw;
 static unsigned char timestamp;
@@ -107,20 +112,20 @@ static void print_usage(char *prg)
 	fprintf(stderr, "         -i  (ignore bitstuffing in bandwidth calculation)\n");
 	fprintf(stderr, "         -e  (exact calculation of stuffed bits)\n");
 	fprintf(stderr, "\n");
-	fprintf(stderr, "Up to %d CAN interfaces with mandatory bitrate can be specified on the \n", MAXSOCK);
-	fprintf(stderr, "commandline in the form: <ifname>@<bitrate>[,<dbitrate>]\n\n");
+	fprintf(stderr, "Up to %d CAN interfaces with mandatory bitrate can be specified on the \n", MAXDEVS);
+	fprintf(stderr, "commandline in the form: <ifname>@<bitrate>[,<dbitrate>]\n");
+	fprintf(stderr, "The interface name 'any' enables an auto detection with the given bitrate[s]\n\n");
 	fprintf(stderr, "The bitrate is mandatory as it is needed to know the CAN bus bitrate to\n");
 	fprintf(stderr, "calculate the bus load percentage based on the received CAN frames.\n");
 	fprintf(stderr, "Due to the bitstuffing estimation the calculated busload may exceed 100%%.\n");
 	fprintf(stderr, "For each given interface the data is presented in one line which contains:\n\n");
-	fprintf(stderr, "(interface) (received CAN frames) (used bits total) (used bits for payload)\n");
+	fprintf(stderr, "(interface) (received CAN frames) (bits total) (bits payload) (bits payload brs)\n");
 	fprintf(stderr, "\nExamples:\n");
-	fprintf(stderr, "\nuser$> canbusload can0@100000 can1@500000 can2@500000 can3@500000 -r -t -b -c\n\n");
-	fprintf(stderr, "%s 2014-02-01 21:13:16 (worst case bitstuffing)\n", prg);
-	fprintf(stderr, " can0@100000   805   74491  36656  74%% |XXXXXXXXXXXXXX......|\n");
-	fprintf(stderr, " can1@500000   796   75140  37728  15%% |XXX.................|\n");
-	fprintf(stderr, " can2@500000     0       0      0   0%% |....................|\n");
-	fprintf(stderr, " can3@500000    47    4633   2424   0%% |....................|\n");
+	fprintf(stderr, "\nuser$> canbusload can0@100000 can1@500000,2000000 can2@500000 -r -t -b -c\n\n");
+	fprintf(stderr, "%s 2024-08-08 16:30:05 (worst case bitstuffing)\n", prg);
+	fprintf(stderr, " can0@100k      192   21980    9136       0  21%% |TTTT................|\n");
+	fprintf(stderr, " can1@500k/2M  2651  475500  234448  131825  74%% |XXXXXXXXXXXXXX......|\n");
+	fprintf(stderr, " can2@500k      855  136777   62968   35219  27%% |RRRRR...............|\n");
 	fprintf(stderr, "\n");
 }
 
@@ -130,6 +135,32 @@ static void sigterm(int signo)
 	signal_num = signo;
 }
 
+static int add_bitrate(char *brstr, unsigned int bitrate)
+{
+	if (bitrate % 1000000 == 0)
+		return sprintf(brstr, "%dM", bitrate / 1000000);
+
+	if (bitrate % 1000 == 0)
+		return sprintf(brstr, "%dk", bitrate / 1000);
+
+	return sprintf(brstr, "%d", bitrate);
+}
+
+static void create_bitrate_string(int stat_idx, int *max_bitratestr_len)
+{
+	int ptr;
+
+	ptr = add_bitrate(&stat[stat_idx].bitratestr[0], stat[stat_idx].bitrate);
+
+	if (stat[stat_idx].bitrate != stat[stat_idx].dbitrate) {
+		ptr += sprintf(&stat[stat_idx].bitratestr[ptr], "/");
+		ptr += add_bitrate(&stat[stat_idx].bitratestr[ptr], stat[stat_idx].dbitrate);
+	}
+
+	if (ptr > *max_bitratestr_len)
+		*max_bitratestr_len = ptr;
+}
+
 static void printstats(int signo)
 {
 	int i, j, percent;
@@ -194,9 +225,9 @@ static void printstats(int signo)
 		else
 			percent = 0;
 
-		printf(" %*s@%-*d %5d %7d %6d %6d %3d%%",
+		printf(" %*s@%-*s %5d %7d %7d %7d %3d%%",
 		       max_devname_len, stat[i].devname,
-		       max_bitrate_len, stat[i].bitrate,
+		       max_bitratestr_len, stat[i].bitratestr,
 		       stat[i].recv_frames,
 		       stat[i].recv_bits_total,
 		       stat[i].recv_bits_payload,
@@ -212,7 +243,7 @@ static void printstats(int signo)
 
 			for (j = 0; j < NUMBAR; j++) {
 				if (j < percent / PERCENTRES)
-					printf("X");
+					printf("%c", stat[i].recv_direction);
 				else
 					printf(".");
 			}
@@ -230,6 +261,7 @@ static void printstats(int signo)
 		stat[i].recv_bits_total = 0;
 		stat[i].recv_bits_dbitrate = 0;
 		stat[i].recv_bits_payload = 0;
+		stat[i].recv_direction = '.';
 	}
 
 	if (!redraw)
@@ -243,14 +275,19 @@ static void printstats(int signo)
 int main(int argc, char **argv)
 {
 	fd_set rdfs;
-	int s[MAXSOCK];
-
+	int s;
 	int opt;
 	char *ptr, *nptr;
 	struct sockaddr_can addr;
 	struct canfd_frame frame;
+	struct iovec iov;
+	struct msghdr msg;
 	int nbytes, i;
-	struct ifreq ifr;
+
+	int have_anydev = 0;
+	unsigned int anydev_bitrate = 0;
+	unsigned int anydev_dbitrate = 0;
+	char anydev_bitratestr[BRSTRLEN]; /* 100000/2000000 => 100k/2M */
 
 	signal(SIGTERM, sigterm);
 	signal(SIGHUP, sigterm);
@@ -300,27 +337,22 @@ int main(int argc, char **argv)
 
 	currmax = argc - optind; /* find real number of CAN devices */
 
-	if (currmax > MAXSOCK) {
-		printf("More than %d CAN devices given on commandline!\n", MAXSOCK);
+	if (currmax > MAXDEVS) {
+		printf("More than %d CAN devices given on commandline!\n", MAXDEVS);
 		return 1;
 	}
 
+	/* prefill stat[] array with given interface assignments */
 	for (i = 0; i < currmax; i++) {
-		ptr = argv[optind + i];
+		ptr = argv[optind + i + have_anydev];
 
 		nbytes = strlen(ptr);
-		if (nbytes >= (int)(IFNAMSIZ + sizeof("@1000000") + 1)) {
+		if (nbytes >= (int)(IFNAMSIZ + sizeof("@1000000,2000000") + 1)) {
 			printf("name of CAN device '%s' is too long!\n", ptr);
 			return 1;
 		}
 
-		pr_debug("open %d '%s'.\n", i, ptr);
-
-		s[i] = socket(PF_CAN, SOCK_RAW, CAN_RAW);
-		if (s[i] < 0) {
-			perror("socket");
-			return 1;
-		}
+		pr_debug("handle %d '%s'.\n", i, ptr);
 
 		nptr = strchr(ptr, '@');
 
@@ -330,55 +362,76 @@ int main(int argc, char **argv)
 			return 1;
 		}
 
+		/* interface name length */
 		nbytes = nptr - ptr;  /* interface name is up the first '@' */
-
 		if (nbytes >= (int)IFNAMSIZ) {
 			printf("name of CAN device '%s' is too long!\n", ptr);
 			return 1;
 		}
 
+		/* copy interface name to stat[] entry */
 		strncpy(stat[i].devname, ptr, nbytes);
-		memset(&ifr.ifr_name, 0, sizeof(ifr.ifr_name));
-		strncpy(ifr.ifr_name, ptr, nbytes);
 
 		if (nbytes > max_devname_len)
 			max_devname_len = nbytes; /* for nice printing */
 
 		char *endp;
-		stat[i].bitrate = strtol(nptr + 1, &endp, 0); /* bitrate is placed behind the '@' */
+		 /* bitrate is placed behind the '@' */
+		stat[i].bitrate = strtol(nptr + 1, &endp, 0);
+
+		/* check for CAN FD additional data bitrate */
 		if (*endp == ',')
 			/* data bitrate is placed behind the ',' */
 			stat[i].dbitrate = strtol(endp + 1, &endp, 0);
 		else
 			stat[i].dbitrate = stat[i].bitrate;
 
-		if (!stat[i].bitrate || stat[i].bitrate > 1000000) {
+		if (!stat[i].bitrate || stat[i].bitrate > 1000000 ||
+		    !stat[i].dbitrate || stat[i].dbitrate > 8000000) {
 			printf("invalid bitrate for CAN device '%s'!\n", ptr);
 			return 1;
 		}
 
-		nbytes = strlen(nptr + 1);
-		if (nbytes > max_bitrate_len)
-			max_bitrate_len = nbytes; /* for nice printing */
+		/* prepare bitrate string for hot path */
+		create_bitrate_string(i, &max_bitratestr_len);
 
-		pr_debug("using interface name '%s'.\n", ifr.ifr_name);
+		stat[i].recv_direction = '.';
 
-		/* try to switch the socket into CAN FD mode */
-		const int canfd_on = 1;
-		setsockopt(s[i], SOL_CAN_RAW, CAN_RAW_FD_FRAMES, &canfd_on, sizeof(canfd_on));
-
-		if (ioctl(s[i], SIOCGIFINDEX, &ifr) < 0) {
-			perror("SIOCGIFINDEX");
-			exit(1);
+		/* handling for 'any' device */
+		if (have_anydev == 0 && strcmp(ANYDEV, stat[i].devname) == 0) {
+			anydev_bitrate = stat[i].bitrate;
+			anydev_dbitrate = stat[i].dbitrate;
+			memcpy(anydev_bitratestr, stat[i].bitratestr, BRSTRLEN);
+			/* no real interface: remove this command line entry */
+			have_anydev = 1;
+			currmax--;
+			i--;
+		} else {
+			stat[i].ifindex = if_nametoindex(stat[i].devname);
+			if (!stat[i].ifindex) {
+				printf("invalid CAN device '%s'!\n", stat[i].devname);
+				return 1;
+			}
+			pr_debug("using interface name '%s'.\n", stat[i].devname);
 		}
+	}
 
-		addr.can_family = AF_CAN;
-		addr.can_ifindex = ifr.ifr_ifindex;
+	s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
+	if (s < 0) {
+		perror("socket");
+		return 1;
+	}
 
-		if (bind(s[i], (struct sockaddr *)&addr, sizeof(addr)) < 0) {
-			perror("bind");
-			return 1;
-		}
+	/* try to switch the socket into CAN FD mode */
+	const int canfd_on = 1;
+	setsockopt(s, SOL_CAN_RAW, CAN_RAW_FD_FRAMES, &canfd_on, sizeof(canfd_on));
+
+	addr.can_family = AF_CAN;
+	addr.can_ifindex = 0; /* any CAN device */
+
+	if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+		perror("bind");
+		return 1;
 	}
 
 	alarm(1);
@@ -386,43 +439,93 @@ int main(int argc, char **argv)
 	if (redraw)
 		printf("%s", CLR_SCREEN);
 
+	/* these settings are static and can be held out of the hot path */
+	iov.iov_base = &frame;
+	msg.msg_name = &addr;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	msg.msg_control = NULL;
+
 	while (running) {
 		FD_ZERO(&rdfs);
-		for (i = 0; i < currmax; i++)
-			FD_SET(s[i], &rdfs);
+		FD_SET(s, &rdfs);
 
-		if (select(s[currmax - 1] + 1, &rdfs, NULL, NULL, NULL) < 0) {
+		if (select(s + 1, &rdfs, NULL, NULL, NULL) < 0) {
 			//perror("pselect");
 			continue;
 		}
 
-		for (i = 0; i < currmax; i++) { /* check all CAN RAW sockets */
+		/* these settings may be modified by recvmsg() */
+		iov.iov_len = sizeof(frame);
+		msg.msg_namelen = sizeof(addr);
+		msg.msg_controllen = 0;
+		msg.msg_flags = 0;
 
-			if (FD_ISSET(s[i], &rdfs)) {
-				nbytes = read(s[i], &frame, sizeof(frame));
+		nbytes = recvmsg(s, &msg, 0);
 
-				if (nbytes < 0) {
-					perror("read");
-					return 1;
-				}
-
-				if (nbytes < (int)sizeof(struct can_frame)) {
-					fprintf(stderr, "read: incomplete CAN frame\n");
-					return 1;
-				}
-
-				stat[i].recv_frames++;
-				stat[i].recv_bits_payload += frame.len * 8;
-				stat[i].recv_bits_dbitrate += can_frame_dbitrate_length(
-						&frame, mode, sizeof(frame));
-				stat[i].recv_bits_total += can_frame_length(&frame,
-									    mode, nbytes);
-			}
+		if (nbytes < 0) {
+			perror("read");
+			return 1;
 		}
+
+		if (nbytes != (int)sizeof(struct can_frame) &&
+		    nbytes != (int)sizeof(struct canfd_frame)) {
+			fprintf(stderr, "read: incomplete CAN frame\n");
+			return 1;
+		}
+
+		/* find received ifindex in stat[] array */
+		for (i = 0; i < currmax; i++) {
+			if (stat[i].ifindex == addr.can_ifindex)
+				break;
+		}
+
+		/* not found? check for unknown interface */
+		if (i >= currmax) {
+			/* drop unwanted traffic */
+			if (have_anydev == 0)
+				continue;
+
+			/* can we add another interface? */
+			if (currmax >= MAXDEVS)
+				continue;
+
+			/* add an new entry */
+			stat[i].ifindex = addr.can_ifindex;
+			stat[i].bitrate = anydev_bitrate;
+			stat[i].dbitrate = anydev_dbitrate;
+			memcpy(stat[i].bitratestr, anydev_bitratestr, BRSTRLEN);
+			stat[i].recv_direction = '.';
+			if_indextoname(addr.can_ifindex, stat[i].devname);
+			nbytes = strlen(stat[i].devname);
+			if (nbytes > max_devname_len)
+				max_devname_len = nbytes; /* for nice printing */
+			currmax++;
+		}
+
+		if (msg.msg_flags & MSG_DONTROUTE) {
+			/* TX direction */
+			if (stat[i].recv_direction == '.')
+				stat[i].recv_direction = 'T';
+			else if (stat[i].recv_direction == 'R')
+				stat[i].recv_direction = 'X';
+		} else {
+			/* RX direction */
+			if (stat[i].recv_direction == '.')
+				stat[i].recv_direction = 'R';
+			else if (stat[i].recv_direction == 'T')
+				stat[i].recv_direction = 'X';
+		}
+
+		stat[i].recv_frames++;
+		stat[i].recv_bits_payload += frame.len * 8;
+		stat[i].recv_bits_dbitrate += can_frame_dbitrate_length(
+			&frame, mode, sizeof(frame));
+		stat[i].recv_bits_total += can_frame_length(&frame,
+							    mode, nbytes);
 	}
 
-	for (i = 0; i < currmax; i++)
-		close(s[i]);
+	close(s);
 
 	if (signal_num)
 		return 128 + signal_num;